Added 10 October 2026 flatboat noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about flatboat at Wordnik → Where our words come from → A flatbottom boat for carrying heavy loads (especially on canals). Related Words: bargehoylighterbateauflatflyboatfishboatbumboatjohnboatfoyboatfloatscow Back to today's word