Meaning of pentavalent

pen•ta•va•lent

Pronunciation: (pen"tu-vā'lunt, pen-tav'u-), [key]
— adj. Chem.
  1. having a valence of 5: pentavalent arsenic.
  2. quinquevalent (def. 2).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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