The story
- Proto-Germanic*flataz
- Old Norseflatr
- Middle Englishflat
- Englishflat
- Proto-Indo-European*bʰeyd-
- Proto-Indo-European*bʰóydos
- Proto-Germanic*baitaz
- Proto-West Germanic*bait
- Old Englishbāt
- Middle Englishbot
- Englishboat
- English todayflatboat
Etymology from Wiktionary, CC BY-SA 4.0.