nu·cle·us (n  kl - s, ny-)n. pl. nu·cle·i (-kl -  ) or nu·cle·us·es 1. A central or essential part around which other parts are gathered or grouped; a core: the nucleus of a city. 2. Something regarded as a basis for future development and growth; a kernel: a few paintings that formed the nucleus of a great art collection. 3. Biology A large, membrane-bound, usually spherical protoplasmic structure within a living cell, containing the cell's hereditary material and controlling its metabolism, growth, and reproduction. 4. Botany a. The central kernel of a nut or seed. b. The center of a starch granule. 5. Anatomy A group of specialized nerve cells or a localized mass of gray matter in the brain or spinal cord. 6. Physics The positively charged central region of an atom, composed of protons and neutrons and containing almost all of the mass of the atom. 7. Chemistry A group of atoms bound in a structure, such as a benzene ring, that is resistant to alteration in chemical reactions. 8. Astronomy a. The central portion of the head of a comet. b. The central or brightest part of a nebula or galaxy. 9. Meteorology A particle on which water vapor molecules accumulate in free air to form a droplet or ice crystal. 10. Linguistics The part of a syllable having the greatest sonority. In the word middlemost (m  dl-m st) the nuclei of the three syllables are (), (l), and (); in the Czech word krk ("neck"), the nucleus is (r).[Latin nuculeus, nucleus, kernel, from nucula, little nut, diminutive of nux, nuc-, nut.] |
nucleus
Noun
pl -clei
1. Physics the positively charged centre of an atom, made of protons and neutrons, about which electrons orbit
2. a central thing around which others are grouped
3. a centre of growth or development: the nucleus of a new relationship
4. Biol the part of a cell that contains the chromosomes and associated molecules that control the characteristics and growth of the cell
5. Chem a fundamental group of atoms in a molecule serving as the base structure for related compounds [Latin: kernel]
| nucleus (nkl-s) Plural nuclei (n kl-) 1. The positively charged central region of an atom, composed of one or more protons and (for all atoms except hydrogen) one or more neutrons, containing most of the mass of the atom. The strong force binds the protons and neutrons, also known as nucleons, to each other, overcoming the mutual repulsion of the positively charged protons. In nuclei with many nucleons, however, the forces of repulsion may overcome the strong force, and the nucleus breaks apart in the process of radioactive decay. The protons and neutrons are arranged in the nucleus in energy levels known as shells analogous to those of the electrons orbiting the nucleus. The number of protons in the nucleus determines the atom's atomic number and its position in the Periodic Table. See more at atom. 2. An organelle in the cytoplasm of eukaryotic cells (all cells except prokaryotes) that contains nearly all the cell's DNA and controls its metabolism, growth, and reproduction. The nucleus is surrounded by a pair of membranes called the nuclear envelope, which can be continuous in places with the membranes of the endoplasmic reticulum. The membranes of the nuclear envelope have interconnected pores that allow the exchange of substances with the cell's cytoplasm. The nuclear DNA is wrapped around proteins (called histones) in strands of chromatin, which exists in a matrix known as nucleoplasm (analogous to the cytoplasm outside the nucleus). Just prior to cell division, the chromatin condenses into individual chromosomes, which contain the cell's hereditary information. The nucleus also contains at least one spherical nucleolus, which mainly contains RNA and proteins and directs the construction of the cell's ribosomes. See more at cell. 3. a. The solid central part of a comet, typically several kilometers in diameter and composed of ice, frozen gases, and embedded chunks of rock and dust. It is the permanent part of a comet from which the coma and tail are generated as the comet approaches the Sun. See more at comet. b. See galactic nucleus. |
Nucleus a central mass or number; a collection of persons or items to which addition will be made.
Examples: nucleus of epic cycles, 1835; of a library, 1875; of pain and pleasure, 1876; of physicists—Lipton, 1970; of fine thoughts, 1820.
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  nucleus - a part of the cell containing DNA and RNA and responsible for growth and reproductioncell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals pronucleus - the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote karyoplasm, nucleoplasm - the protoplasm that constitutes the nucleus of a cell nucleole, nucleolus - a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis chromatin, chromatin granule - the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins; during mitotic division it condenses into chromosomes achromatin - the part of a cell nucleus that is relatively uncolored by stains or dyes linin - an obsolete term for the network of viscous material in the cell nucleus on which the chromatin granules were thought to be suspended chromosome - a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order; "humans have 22 chromosome pairs plus two sex chromosomes" cell organ, cell organelle, organelle - a specialized part of a cell; analogous to an organ; "the first organelle to be identified was the nucleus" subthalamic nucleus - an oval mass of grey matter located in the caudal part of the subthalamus; associated with the striate body |
| 2. | nucleus - the positively charged dense center of an atom midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure nucleon - a constituent (proton or neutron) of an atomic nucleus atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element | |
| 3. | nucleus - a small group of indispensable persons or things; "five periodicals make up the core of their publishing program" set - a group of things of the same kind that belong together and are so used; "a set of books"; "a set of golf clubs"; "a set of teeth" cadre - a nucleus of military personnel capable of expansion | |
| 4. | nucleus - (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole midpoint, centre, center - a point equidistant from the ends of a line or the extremities of a figure comet - (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit | |
| 5. | nucleus - any histologically identifiable mass of neural cell bodies in the brain or spinal cord neural structure - a structure that is part of the nervous system dentate nucleus - a large laminar nucleus of grey matter within the white matter of each cerebral hemisphere | |
| 6. | nucleus - the central structure of the lens that is surrounded by the cortex anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure" |
nucleus
Translations
n nucleus [ˈnjuːkliəs]
1 the central part of an atom. kern نُواة الذَّرَّه ядро jádro kerne; nukleus der Kern πυρήνας ατόμου núcleo (aatomi)tuum هسته مرکزى ydin noyau גַרעִין गूदा jezgra (atom)mag inti atom kjarni nucleo 原子核 원자핵, 핵 branduolys kodols nukleus nucleus (atom)kjerne jądro núcleo nucleu ядро jadro jedro jezgro kärna ส่วนที่อยู่ตรงกลางของอะตอม atom çekirdeği, nükleon 原子核 ядро ايٹم کا مرکزي حصہ tâm 原子核
2 the part of a plant or animal cell that controls its development. selkern بِذْرَه център jádro kerne der Kern πυρήνας κυττάρου núcleo rakutuum هسته tuma nucléus, noyau גַרעִין नाभिक jezgrica,nukleola sejtmag inti sel frumukjarni nucleo, nocciolo 細胞核 세포핵 branduolys, centras kodols nukleus kern (celle)kjerne jądro núcleo nucleu ядро jadro jedro jezgro kärna ส่วนที่อยู่ตรงกลางของเซลล์ของสิ่งมีชีวิต çekirdek, çekirdek hücre 細胞核 кісточка; зародок پودوں يا جانوروں کا وہ سيل جو نشو و نما کو کنٹرول کرتا ہے nhân 细胞核
adj nuclear [ˈnjuːkliə]
1 using atomic energy a nuclear power station; nuclear weapons. kernagtig نَوَوي ядрен nukleární kerne-; atom- Atom-... πυρηνικός nuclear tuuma- هسته ای ydin- nucléaire גַרעִינִי नाभिकीय nuklearan nukleáris nuklir kjarnorku- nucleare 原子力の 핵의, 원자력을 이용한 atominis atoma- nuklear nucleair kjerne-, atom- jądrowy nuclear nuclear ядерный nukleárny atomski nuklearan kärn-, atom- เกี่ยวกับพลังงานนิวเคลียร์ nükleer, atom enerjisi kullanan 核的 ядерний ايٹمک توانائي کا استعمال hạt nhân 核的
2 of a nucleus. kernagtig مُتَعَلِّق بالنَّواة ядрен jaderný kerne- Kern-... πυρηνικός, που έχει σχέση με τον πυρήνα nuclear tuuma- از هسته ydin- nucléaire גַרעִינִי नाभिक jezgrin, nuklearan mag- nuklir kjarnorku- nucleare 核の (원자·세포)핵의 branduolio, branduolinis kodola- nukleus nucleair kjerne- jądrowy nuclear nuclear содержащий ядро jadrový jedrski nuklearni kärn- เกี่ยวกับนิวเคลียร์ nükleer, çekirdek ile ilgili 核心的 такий, що містить в собі ядро جوھري nhân 核心的
n nuclear device
a device or a weapon that contains a nuclear bomb. kerntoestel جِهاز نَوَوي ядрено оръжие nukleární zařízení kernevåben die nukleare Bedrohung πυρηνικός εξοπλισμός departamento nuclear tuumaseade, tuumarelv صلاح هسته ای נֶשֶק גַרעִינִי नाभिकीय यूनिट nuklearni stroj, naprava nukleáris robbanószerkezet senjata nuklir (arma nucleare) 核装置 branduolinis įtaisas kodolierīce; atomierocis peralatan nuklear kernwapen, atoomwapen kjernevåpen glowica jądrowa устройство с ядерным зарядом; ядерное оружие nukleárne (jadrové) zariadenie jedrska naprava nuklearna sprava [] kärnvapenbärare อาวุธนิวเคลียร์ atom bombalı aygıt 核武器 пристрій з ядерним зарядом جوہري اسلحہ thiết bị hạt nhân 核武器
nuclear disarmament
the act of ceasing to store atomic weapons. ontwapening نَزْح السِّلاح النَّوَوي ядрено разоръжаване nukleární odzbrojení atom-nedrustning nukleare Abrüstung πυρηνικός αφοπλισμός desarme nuclear tuumadesarmeerimine خلع سلاح هسته ای ydinasevarustelun lopettaminen désarmement nucléaire פֵּירוּק נֶשֶק גַרעִינִי परमाणवीय निरस्त्रीकरण nuklearno razoružanje nukleáris leszerelés perlucutan nuklir kjarnorkuafvopnun disarmo nucleare 核軍縮 핵군축 branduolinis nusiginklavimas kodolatbruņošanās pelucutan senjata nuklear kernontwapening atomnedrustning rozbrojenie atomowe desarmamento nuclear dezarmare nucleară ядерное разоружение nukleárne odzbrojenie jedrska razorožitev nuklearno razoružanje kärnvapennedrustning การลดอาวุธนิวเคลียร์ nükleer silahsızlanma 核裁軍 ядерне роззброєння جوہري اسلحہ اکٹھا کرنے پر روک sự giải trừ vũ khí hạt nhân 核裁军
nuclear energy
atomic energy. kernkrag طاقَةٌ نَوَويَّه ядрена енергия jaderná energie atomenergi die Atomenergie πυρηνική ενέργεια energía nuclear tuumaenergia انرژى هسته ای ydinenergia énergie nucléaire אֱנֶרגיָה אָטוֹמִית परमाणु ऊर्जा nuklearna energija atomenergia tenaga nuklir kjarnorka energia nucleare 原子力 핵에너지 atominė, branduolinė energija atomenerģija tenaga nuklear kernenergie kjernekraft, atomenergi energia jądrowa energia nuclear energie nucleară ядерная энергия jadrová energia jedrska energija nuklearna energija atom-, kärnenergi พลังงานนิวเคลียร์ atom enerjisi 核能 енергія атомного ядра جوہري توانائي năng lượng hạt nhân 核能
nuclear reactor
an apparatus for producing nuclear energy. kernreaktor مُفاعِل نَوَوي ядрен реактор jaderný reaktor atomreaktor der Kernreaktor πυρηνικός αντιδραστήρας reactor nuclear tuumareaktor رکتور هسته ای ydinreaktori réacteur nucléaire כּוּר גַרעִינִי नाभिकीय रिएक्टर nuklearni reaktor atomreaktor reaktor nuklir kjarnakljúfur/-ofn reattore nucleare 原子炉 원자로 branduolinis reaktorius atomreaktors reactor nuklear kernreactor atomreaktor reaktor jądrowy reactor nuclear reactor nuclear атомный реактор jadrový reaktor jedrski nuklearni reaktor atom-, kärnreaktor เตาแยกปฎิกรณ์ปรมาณู atom reaktörü 核反應堆 ядерний реактор جوہري توانائي کي پيدائش کا مرکز lò phản ứng hạt nhân 核反应堆
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