WordReference Random House Unabridged Dictionary of American English © 2026
pen•ta•hy•drate
(pen′tə hī′drāt),USA pronunciation n. [Chem.]
pen′ta•hy′drat•ed, adj.
- Chemistrya hydrate that contains five molecules of water, as potassium molybdate, KMoO4·5H2O.
- penta- + hydrate 1915–20
'pentahydrate' also found in these entries (note: many are not synonyms or translations):