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| tree·nail [ tr nàyl, trénn'l, trúnn'l ] (plural tree·nails) or tre·nail [ tr nàyl, trénn'l ] (plural tre·nails) or trun·nel [ trúnn'l ] (plural trun·nels) |
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wooden peg used in shipbuilding: a large cylindrical peg made of dry wood that expands to give a tight fit when it is wet and is used to fasten timbers together, e.g. in ships
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