Meaning of promethium

pro•me•thi•um

Pronunciation: (pru-mē'thē-um), [key]
— n. Chem.
  1. a rare-earth, metallic, trivalent element. Symbol: Pm; at. no.: 61.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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