- a dowel used for pinning planks or timbers together
WordReference Random House Unabridged Dictionary of American English © 2026
tree•nail
(trē′nāl′, tren′l, trun′l),USA pronunciation n.
- a wooden pin that swells when moist, used for fastening together timbers, as those of ships.
- Middle English trenayl. See tree, nail 1250–1300
Collins Concise English Dictionary © HarperCollins Publishers::
treenail, trenail /ˈtriːneɪl; ˈtrɛnəl/trunnel /ˈtrʌnəl/ n
'treenail' also found in these entries (note: many are not synonyms or translations):