extensile

from 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}]

from The Collaborative International Dictionary of English v.0.48

Extensile \Ex*ten"sile\a.
   Suited for, or capable of, extension; extensible. --Owen.
   [1913 Webster]