English dictionary treenail meaning and definition Definition and meaning of treenail at MeaningMonkey.org. treenail meaning and definition in the English Dictionary. TREENAIL nounDefinition of treenail (noun)a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fastsynonyms: trenail, trunnel Source: Princeton University Wordnet
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