1. [ noun ] (chemistry) 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: atomic_number_15 P
Related terms: chemical_element apatite
2. [ noun ] (astronomy) a planet (usually Venus) seen just before sunrise in the eastern sky
Synonyms: daystar morning_star
Related terms: planet
Similar spelling:   phosphorous