English

gasboat

gas + boat

A compound of gas + boat

Ancient Greek χάος ‘chasm’

Dutch gas

English gas

Proto-Indo-European *bʰeyd- ‘to break’

…

Proto-Germanic *baitaz ‘boat’

Proto-West Germanic *bait ‘boat’

Old English bāt

Middle English bot

English boat

Today it means

noun A boat designed to pump gas into a burning ship to extinguish the flames.

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