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tree·nailor tre·nail (trē′nāl′, trĕn′əl, trŭn′əl) also trun·nel (trŭn′əl)
A wooden peg used as a fastener in building wooden ships or timber-frame buildings.
treenail(ˈtriːneɪl; ˈtrɛnəl) or
(Building) a dowel used for pinning planks or timbers together
or tre•nail(ˈtriˌneɪl, ˈtrɛn l, ˈtrʌn l)
a wooden pin that swells when moist, used for fastening timbers.
A wooden dowel used to prevent a wooden mortise and tenon joint from slipping apart. Trunnels were usually made of a hardwood such as oak or hickory.