The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         Such things as constrict the fibers.     --Arbuthnot.
   [1913 Webster]

         Membranous organs inclosing a cavity which their
         contraction serves to constrict.         --Todd &
                                                  Bowman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "constrict":
   abbreviate, bang, bar, barricade, batten, batten down, block,
   block up, blockade, bolt, button, button up, chock, choke,
   choke off, circumscribe, clap, close, close off, close tight,
   close up, coarct, compact, compress, concentrate, condense,
   confine, consolidate, constrain, constringe, contain, contract,
   cover, cramp, crowd, curb, curtail, debar, decrease, diminish, dog,
   draw, draw in, draw together, fasten, fold, fold up, gather, go in,
   jam, key, knit, latch, limit, lock, lock out, lock up, narrow,
   obstruct, occlude, pack, padlock, plait, plumb, pucker, pucker up,
   purse, reduce, restrain, restrict, seal, seal off, seal up, secure,
   shorten, shrink, shut, shut off, shut out, shut the door,
   shut tight, shut up, slam, snap, snape, solidify, squeeze,
   squeeze shut, stifle, stop up, straiten, strangle, strangulate,
   suffocate, taper, wrinkle, zip up, zipper