retractile

from WordNet (r) 3.0 (2006)

retractile
    adj 1: capable of retraction; capable of being drawn back; "cats
           have retractile claws" [ant: {nonretractable},
           {nonretractile}]

from The Collaborative International Dictionary of English v.0.48

Retractile \Re*tract"ile\ (r[-e]*tr[=a]kt"[i^]l), a. [Cf. F.
   -r['e]tractile.] (Physiol.)
   Capable of retraction; capable of being drawn back or up; as,
   the claws of a cat are retractile.
   [1913 Webster]