The Collaborative International Dictionary of English v.0.48:

Rabbet \Rab"bet\ (r[a^]b"b[e^]t), v. t. [imp. & p. p.
   Rabbeted; p. pr. & vb. n. Rabbeting.] [F. raboter to
   plane, plane down,rabot a plane; pref. re- re- + OF. abouter,
   aboter. See Abut, and cf. Rebut.]
   1. To cut a rabbet in; to furnish with a rabbet.
      [1913 Webster]

   2. To unite the edges of, as boards, etc., in a rabbet joint.
      [1913 Webster]