Treenail

[tri:neil]

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

Edited by Karl--From WordNet

(n.) A long wooden pin used in fastening the planks of a vessel to the timbers or to each other.

Checked by Hayes

n. Trunnel.

Checked by Anita