The Collaborative International Dictionary of English v.0.48:
Extensile \Ex*ten"sile\a. Suited for, or capable of, extension; extensible. --Owen. [1913 Webster]WordNet (r) 3.0 (2006):
extensile adj 1: capable of being protruded or stretched or opened out; "an extensile tongue"; "an extensible measuring rule" [syn: extensile, extensible] [ant: inextensible, nonextensile, nonprotractile]