English

heptahydride

From hepta- + hydride.

Proto-Indo-European *septḿ̥ ‘seven’

Proto-Hellenic *heptə́ ‘seven’

Ancient Greek ἑπτά ‘seven’

Proto-Indo-European *wed- ‘water’

Proto-Indo-European *wódr̥ ‘water’

Proto-Hellenic *údōr ‘water’

Ancient Greek ῡ̆̔́δωρ ‘water’

Today it means

noun Any hydride containing seven atoms of hydrogen per molecule.

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

Etymograph / heptahydride