atom

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at·om

 (ăt′əm)
n.
1.
a. A part or particle considered to be an irreducible constituent of a specified system.
b. The irreducible, indestructible material unit postulated by ancient atomism.
2. An extremely small part, quantity, or amount.
3. Physics & Chemistry
a. The smallest unit of an element, having all the characteristics of that element and consisting of a very small and dense central nucleus containing protons and neutrons, surrounded by one or more shells of orbiting electrons. Atoms remain undivided in chemical reactions except for the donation, acceptance, or exchange of valence electrons.
b. This unit regarded as a source of nuclear energy.

[Middle English attome, from Latin atomus, from Greek atomos, indivisible, atom : a-, not; see a-1 + tomos, cutting (from temnein, to cut; see tem- in Indo-European roots).]

atom

(ˈætəm)
n
1. (Atomic Physics)
a. the smallest quantity of an element that can take part in a chemical reaction
b. this entity as a source of nuclear energy: the power of the atom. See also atomic structure
2. any entity regarded as the indivisible building block of a theory
3. (Philosophy) the hypothetical indivisible particle of matter postulated by certain ancient philosophers as the fundamental constituent of matter. See also atomism
4. a very small amount or quantity; minute fragment: to smash something to atoms; there is not an atom of truth in his allegations.
[C16: via Old French and Latin, from Greek atomos (n), from atomos (adj) that cannot be divided, from a-1 + temnein to cut]

at•om

(ˈæt əm)

n.
1. the smallest component of an element having the chemical properties of the element, consisting of a positively charged nucleus of neutrons and protons that exerts an electrical attraction on one or more electrons in motion around it.
2. this component as the source of nuclear energy.
3. a hypothetical particle of matter so minute as to admit of no division.
4. anything extremely small; a minute quantity; speck; scintilla: not an atom of truth in that statement.
[1350–1400; < Latin atomus < Greek átomos literally, undivided =a- a-6 + -tomós divided <témnein to cut]
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at·om

(ăt′əm)
The smallest unit of an element, consisting of protons and neutrons in a dense central nucleus orbited by a number of electrons. In electrically neutral atoms, the number of protons equals the number of electrons. Atoms remain intact in chemical reactions except for the removal, transfer, or exchange of certain electrons. See Note at subatomic particle.

atom

The smallest part of an element capable of taking part in a chemical change.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atom - (physics and chemistry) the smallest component of an element having the chemical properties of the elementatom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
substance - the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
elementary particle, fundamental particle - (physics) a particle that is less complex than an atom; regarded as constituents of all matter
nucleus - the positively charged dense center of an atom
isotope - one of two or more atoms with the same atomic number but with different numbers of neutrons
monad - (chemistry) an atom having a valence of one
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
carbon atom - an atom of carbon
hydrogen atom - an atom of hydrogen
molecule - (physics and chemistry) the simplest structural unit of an element or compound
free radical, radical - an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells"
2.atom - (nontechnical usage) a tiny piece of anythingatom - (nontechnical usage) a tiny piece of anything
grain - a relatively small granular particle of a substance; "a grain of sand"; "a grain of sugar"
grinding - material resulting from the process of grinding; "vegetable grindings clogged the drain"
material, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
chylomicron - a microscopic particle of triglycerides produced in the intestines during digestion; in the bloodstream they release their fatty acids into the blood
flyspeck - a tiny dark speck made by the excrement of a fly
identification particle - a tiny particle of material that can be added to a product to indicate the source of manufacture

atom

noun particle, bit, spot, trace, scrap, molecule, grain, dot, fragment, fraction, shred, crumb, mite, jot, speck, morsel, mote, whit, tittle, iota, scintilla (rare) one carbon atom attached to four hydrogens
Translations
ذَرَّهذَرَّةمِقْدار ضَئيل جِداً
atomzrnko
atomgran
aatom
atomi
atom
atom
atóm, frumeindsnefill
原子元素
원자
atomasatominė energijaatominisdalelė
atomsdruska
atóm
atom
atom
อะตอม
nguyên tử

atom

[ˈætəm]
A. N
1. (Phys) → átomo m
2. (fig) → pizca f
there is not an atom of truth in iteso no tiene ni pizca de verdad
if you had an atom of sensesi tuvieras una gota de sentido común
to smash sth to atomshacer algo añicos
B. CPD atom bomb Nbomba f atómica
atom smasher Nacelerador m de partículas atómicas, rompeátomos m inv

atom

[ˈætəm] n (PHYSICS)atome matom bomb n (mainly British)bombe f atomique

atom

n
Atom nt
(fig) to powder something into atomsetw völlig zertrümmern; not an atom of truthkein Körnchen Wahrheit

atom

[ˈætəm] natomo (fig) not an atom of truthnemmeno un pizzico di verità

atom

(ˈӕtəm) noun
1. the smallest part of an element.
2. anything very small. There's not an atom of truth in what she says.
aˈtomic (-ˈto-) adjective
atom(ic) bomb
a bomb using atomic energy.
atomic energy
very great energy obtained by breaking up the atoms of some substances.
atomic power
power (for making electricity etc) obtained from atomic energy.

atom

ذَرَّة atom atom Atom άτομο átomo atomi atome atom atomo 原子 원자 atoom atom atom átomo атом atom อะตอม atom nguyên tử 原子

at·om

n. átomo.