English

hemihydrate

From hemi- + hydrate.

A compound of hemi- + hydrate

Proto-Indo-European *sem- ‘one, whole’

Proto-Indo-European *sēmi ‘half’

English hemi-

Proto-Indo-European *wed- ‘water’

Proto-Indo-European *wódr̥ ‘water’

Proto-Hellenic *údōr ‘water’

Ancient Greek ῡ̆̔́δωρ ‘water’

French hydrate

Today it means

noun A hydrate whose solid contains one molecule of water of crystallization per two molecules, or per two unit cells

Language periods are conventional ranges, not dates for this word.

Etymograph / hemihydrate