Noun
- 1. phosphorus, P, atomic number 15, chemical element, element
- usage: 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
- 2. P, p, letter, letter of the alphabet, alphabetic character
- usage: the 16th letter of the Roman alphabet
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