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plural treenails
A wooden peg or pin used as a fastener. quotations examples
Long treenails were quite difficult to drive, often being damaged in the process, with ends becoming "broomed", or worse, split, necessitating the head being trimmed, or far worse, the removal of the treenail.
2005 Michael McCarthy: Ships' Fastenings: From Sewn Boat to Steamship. ISBN:1-58544-451-0