The Collaborative International Dictionary
Rabbet \Rab"bet\, n. [See Rabbet, v., and cf. Rebate, n.]
(Carp.) A longitudinal channel, groove, or recess cut out of the edge or face of any body; especially, one intended to receive another member, so as to break or cover the joint, or more easily to hold the members in place; thus, the groove cut for a panel, for a pane of glass, or for a door, is a rabbet, or rebate.
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Same as Rabbet joint, below.
Rabbet joint (Carp.), a joint formed by fitting together rabbeted boards or timbers; -- called also rabbet.
Rabbet plane, a joiner's plane for cutting a rabbet.
--Moxon.
Wiktionary
n. (context rare woodworking English) See definition at rabbet.
WordNet
n. a joint formed by fitting together two rabbeted boards