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protium: Meaning and Definition of

pro•ti•um

Pronunciation: (prō'tē-um, -shē-um), [key]
— n. Chem.
  1. the lightest and most common isotope of hydrogen. Symbol: H
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
protistology proto-
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