Webster's English Dictionary

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phosphor

phos.phor \'fa:s-f*r, -.fo.(*)r\ \same or -.fo-(*)r\ n also phos.phore [L 
   phosphorus, fr. Gk pho-sphoros, lit., light bringer, fr. p]ho-sphoros 
   light-bearing, fr. pho-s- + pherein to carry, bring - more at BEAR cap  1: 
   MORNING STAR; specif : Venus as morning star  2: a phosphorescent 
   substance; specif : a substance that emits ligh t when excited by radiation