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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]