Contractile /(?)/

Con·tract·ile

Contractile

a.
  1. tending to contract; having the power or property of contracting, or of shrinking into shorter or smaller dimensions; as, the contractile tissues.
    The heart's contractile force.
    — H. Brooke.
    Each cilium seems to be composed of contractile substance.
    — Hixley.

Phrases & Compounds

Contractile vacuole
a pulsating cavity in the interior of a protozoan, supposed to be excretory in function. There may be one, two, or more.