CONTRACTILE
contractile
(adjective) capable of contracting or being contracted; “the contractile wings of an insect”
Source: WordNet® 3.1
Etymology
Adjective
contractile (comparative more contractile, superlative most contractile)
Capable of contracting, or of being contracted.
Source: Wiktionary
Con*tract"ile, a. Etym: [Cf. F. contractile.]
Definition: 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.
Contractile vacuole (Zoöl.), a pulsating cavity in the interior of a
protozoan, supposed to be excretory in function. There may be one,
two, or more.
Source: Webster’s Unabridged Dictionary 1913 Edition