'Protractile' definitions:

Definition of 'protractile'

From: WordNet
adjective
Able to be extended; "protractile muscle" [syn: protractile, protractible]

Definition of 'Protractile'

From: GCIDE
  • Protractile \Pro*tract"ile\, a. Capable of being protracted, or protruded; protrusile. [1913 Webster]