retractile

Sem′i-recon′dite, half-hidden; Sem′i-rē′flex, involuntarily performed, but not entirely independent of the will; Sem′i-reg′ular, pertaining to a quadrilateral having four equal sides, but only pairs of equal angles; Sem′i-retrac′tile, retractile to some extent.—n.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

The Falcons, on account of their general perfection, their rapid flight, their piercing vision, their perfect feet armed with retractile claws, the beauty of their forms, and the ease and rapidity of their motions; 2nd.

From Contributions to the Theory of Natural Selection A Series of Essays by Alfred Russel Wallace

The claws are large, strongly curved, compressed, very sharp, and exhibit the retractile condition in the highest degree.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" by Various

In Loligo they are completely retractile, very slightly so in the majority of the Oigopsida, and in Rhynchoteuthis they are united to form a beak-like appendage.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

The fore-feet have five toes, the hind-feet four or five; the claws are strong, blunt, and formed for digging, and are not retractile.

From The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde by Various