Source : Webster's Revised Unabridged Dictionary (1913)

Constrict \Con*strict"\, v. t. [imp. & p. p. {Constricted}; p.
   pr. & vb. n. {Constricting}.] [L. constrictus, p. p. of
   constringere. See {Constrain}.]
   To draw together; to render narrower or smaller; to bind; to
   cramp; to contract or cause to shrink.

         Such things as constrict the fibers.     --Arbuthnot.

         Membranous organs inclosing a cavity which their
         contraction serves to constrict.         --Todd &
                                                  Bowman.

Source : WordNet®

constrict
     v 1: squeeze or press together; "she compressed her lips"; "the
          spasm contracted the muscle" [syn: {compress}, {squeeze},
           {compact}, {contract}, {press}]
     2: become tight or as if tight; "Her throat constricted" [syn:
        {constringe}, {narrow}]