pentahydrate

[ pen-tuh-hahy-dreyt ]
/ ˌpɛn təˈhaɪ dreɪt /

noun Chemistry.

a hydrate that contains five molecules of water, as potassium molybdate, KMoO4⋅5H2O.

Origin of pentahydrate

First recorded in 1915–20; penta- + hydrate
Related formspen·ta·hy·drat·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019