The Collaborative International Dictionary of English v.0.48:

Bosket \Bos"ket\, Bosquet \Bos"quet\, n. [F. bosquet a little
   wood, dim. fr. LL. boscus. See Boscage, and cf. Bouquet.]
   (Gardening)
   A grove; a thicket; shrubbery; an inclosure formed by
   branches of trees, regularly or irregularly disposed.
   [1913 Webster]