Webster's English Dictionary

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phosphorus

Cross references:
  1. element               
 
phos.pho.rus \'fa:s-f(*-)r*s\ n [NL, fr. Gk pho-sphoros light-bearing - 
   more at PHOSPHOR] often attrib  1: a phosphorescent substance or body; esp 
   : one that shines or glo ws in the dark 2: a nonmetallic multivalent 
   element of the nitrogen family that occurs wid ely esp. as phosphates