#1 p n. [phosphorus, P, atomic number 15] 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. wn
#2 p n. [P] the 16th letter of the Roman alphabet. wn
#3 p n. [P] the 16th letter of the Roman alphabet. wn
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