flatboat flat • flatbottom · · · Info · Definitions · Synonyms · Characters · · flatboat · · Text Latin · · Script 8 · · Length Definitions · · · (noun) a flatbottom boat for carrying heavy loads (especially on canals). Synonyms: barge, hoy, lighter. · · Noun Definition 1 Synonyms · · · barge · · Synonym 1 hoy · · Synonym 2 lighter · · Synonym 3 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 f latin small letter f U+0066 l latin small letter l U+006C o latin small letter o U+006F t latin small letter t U+0074