A hydrate whose solid contains two molecules of water of crystallization per molecule, or per unit cell(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "dihydrate" in a sentence
"Cupric chloride dihydrate - Harmful if swallowed or inhaled."
"For brines stronger than eutectic, the temperatures shown are the saturation temperatures for sodium chloride dihydrate."
"Brines stronger than eutectic deposit excess sodium chloride as dihydrate when cooled, and freeze at eutectic. c Saturated brine at 60°F. the observed salometer reading."