phosphorus(redirected from phosphorus restriction)
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1. Symbol P A highly reactive, poisonous, nonmetallic element occurring naturally in phosphates, especially apatite, and existing in three allotropic forms, white (or sometimes yellow), red, and black (or violet). An essential element for biological cells, it is used in safety matches, pyrotechnics, incendiary shells, and fertilizers and to protect metal surfaces from corrosion. Atomic number 15; atomic weight 30.9738; melting point (white) 44.15°C; boiling point 280.5°C; specific gravity (white) 1.82, (red) 2.16, (black) 2.25 to 2.69; valence 3, 4, 5. See Periodic Table.
2. A phosphorescent substance.
3. Phosphorus Astronomy See Lucifer.
npl phosphori (-rai)
1. (Elements & Compounds) an allotropic nonmetallic element occurring in phosphates and living matter. Ordinary phosphorus is a toxic flammable phosphorescent white solid; the red form is less reactive and nontoxic: used in matches, pesticides, and alloys. The radioisotope phosphorus-32 (radiophosphorus), with a half-life of 14.3 days, is used in radiotherapy and as a tracer. Symbol: P; atomic no: 15; atomic wt: 30.973 762; valency: 3 or 5; relative density: 1.82 (white), 2.20 (red); melting pt: 44.1°C (white); boiling pt: 280°C (white)
2. (General Physics) a less common name for a phosphor
[C17: via Latin from Greek phōsphoros light-bringing, from phōs light +pherein to bring]
(Astronomy) a morning star, esp Venus
phos•pho•rus(ˈfɒs fər əs)
n., pl. -pho•ri (-fəˌraɪ)
1. a nonmetallic element existing in yellow, red, and black allotropic forms and an essential constituent of plant and animal tissue: used, in combined form, in matches and fertilizers. Symbol: P; at. wt.: 30.974; at. no.: 15; sp. gr.: (yellow) 1.82 at 20°C, (red) 2.20 at 20°C, (black) 2.25–2.69 at 20°C.
2. any phosphorescent substance.
[1620–30; < New Latin phōsphorus, Latin: morning star; see phosphor]
Symbol P A highly reactive, poisonous nonmetallic element occurring naturally in phosphates and existing in white (or sometimes yellow), red, and black forms. It is an essential component of protoplasm. Phosphorus is used to make matches, fireworks, and fertilizers and to protect metal surfaces from corrosion. Atomic number 15. See Periodic Table.
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|Noun||1.||phosphorus - a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms|
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
apatite - a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus
|2.||Phosphorus - a planet (usually Venus) seen just before sunrise in the eastern sky|
major planet, planet - (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction
phosphorus[ˈfɒsfərəs] N → fósforo m
phosphorus[ˈfɒsfərəs] n → phosphore m
n → Phosphor m
phosphorus[ˈfɒsf/ərəs] n → fosforo
n. fósforo, elemento no metálico que se encuentra en alcaloides.