phosphorus

Other Definitions
phosphorus (enc)

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 atomic number 15, P 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 daystar, morning star planet - any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system

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