treenail treen • treescape · · · Info · Definitions · Synonyms · Characters · · treenail · · Text Latin · · Script 8 · · Length Definitions · · · (noun) a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast. Synonyms: trenail, trunnel. · · Noun Definition 1 Synonyms · · · trenail · · Synonym 1 trunnel · · Synonym 2 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074