Contractile

from WordNet (r) 3.0 (2006)

contractile
    adj 1: capable of contracting or being contracted; "the
           contractile wings of an insect"

from The Collaborative International Dictionary of English v.0.48

Contractile \Con*tract"ile\, a. [Cf. F. contractile.]
   tending to contract; having the power or property of
   contracting, or of shrinking into shorter or smaller
   dimensions; as, the contractile tissues.
   [1913 Webster]

         The heart's contractile force.           --H. Brooke.
   [1913 Webster]

         Each cilium seems to be composed of contractile
         substance.                               --Hixley.
   [1913 Webster]

   {Contractile vacuole} (Zool.), a pulsating cavity in the
      interior of a protozoan, supposed to be excretory in
      function. There may be one, two, or more.
      [1913 Webster]