Meaning of pentahydrate

pen•ta•hy•drate

Pronunciation: (pen"tu-hī'drāt), [key]
— n. Chem.
  1. a hydrate that contains five molecules of water, as potassium molybdate, KMoO&multiplydot;5HO.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.