Adjective
Capable of retraction; capable of being drawn back or up; as, the claws of a cat are retractile.
Source: Webster's dictionarycats have retractile claws Source: Internet
The authors suggest the flippers may either be retractile, and the "scaly" appearance could be caused by parasites. Source: Internet
Feliformia claws are often retractile, or rarely, semiretractile. Source: Internet