Crossword clue: a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast

The most common answer is treenail (8 letters).

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

treenail 8 letters wn-def

a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast

trenail 7 letters wn-def

a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast

trunnel 7 letters wn-def

a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast