n. 木拴

[ noun ]
a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast
<noun.artifact>

Trenail \Tre"nail`\, n. (Shipbuilding)
Same as {Treenail}.

Treenail \Tree"nail`\, n. [Tree + nail.] (Shipbuilding)
A long wooden pin used in fastening the planks of a vessel to
the timbers or to each other. [Written also {trenail}, and
{trunnel}.]