English
lightboat
From light (noun) + boat (noun).
Proto-Indo-European *lewk- ‘to shine’
…
Proto-Germanic *leuhtą
Proto-West Germanic *leuht ‘light’
Old English lēoht
Middle English light ‘light, illumination’
English light
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 with a light as a navigation aid; (loosely) any such boat or lightship.
Language periods are conventional ranges, not dates for this word.
Etymograph / lightboat