English

hydrofocus

From hydro- + focus.

Proto-Indo-European *wed- ‘water’

Proto-Indo-European *wódr̥ ‘water’

Proto-Hellenic *údōr ‘water’

Ancient Greek ῡ̆̔́δωρ ‘water’

Latin focus ‘hearth’

English focus

Today it means

verb To concentrate a stream of water into a small area

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

Etymograph / hydrofocus