Definition of rabbets:
(n) :
A longitudinal channel, groove, or recess cut out of the edge or face of a plank of wood or other material; especially, one intended to fit another member to form a joint.
(v) :
(transitive) To cut a rabbet in a piece of material.
(n) :
Obsolete form of rabbit. [A mammal of most genera of the family Leporidae, with long ears, long hind legs and a short, fluffy tail.]