phosphorus > define

noun

• 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.
  • synonyms: P, atomic number 15
• A planet (usually Venus) seen just before sunrise in the eastern sky.
  • synonyms: morning star, daystar, Lucifer

• (n.) Hence, any substance which shines in the dark like phosphorus, as certain phosphorescent bodies.
• (n.) The morning star; Phosphor.
• (n.) A poisonous nonmetallic element of the nitrogen group, obtained as a white or yellowish, translucent waxy substance, having a characteristic disagreeable smell. It is very active chemically, must be preserved under water, and unites with oxygen even at ordinary temperatures, giving a faint glow, -- whence its name. It always occurs compined, usually in phosphates, as in the mineral apatite, in bones, etc. It is used in the composition on the tips of friction matches, and for many other purposes. The molecule contains four atoms. Symbol P. Atomic weight 31.0.