Etymology
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tenon (n.)

in carpentry, "the projection inserted to make a joint," late 14c., from Anglo-French tenoun, Old French tenon "a tenon," from Old French tenir "to hold" (see tenet). As a verb from 1590s.

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Definitions of tenon

tenon (n.)
a projection at the end of a piece of wood that is shaped to fit into a mortise and form a mortise joint;
From wordnet.princeton.edu