extensile

When the puncture into the nut is completed one or more eggs are inserted by means of an extensile, thread-like tube, or ovipositor, of the same length as the snout.

From Northern Nut Growers Association Report of the Proceedings at the Eleventh Annual Meeting Washington, D. C. October 7 and 8, 1920 by Northern Nut Growers Association

Most of the caterpillars have oval, slug-shaped, smooth bodies, with the under surface flattened, and very small heads, which in many species can be extended by means of an extensile neck.

From Butterflies Worth Knowing by Clarence M. Weed

There are no teeth; and although the tongue is long and worm-like, it is not extensile.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various

Bill shorter than the head, straight, conical; tongue long and extensile; nostrils without bristles, partly closed by a membrane; wings with the second primary somewhat the longest; tail-feathers soft and flexible.

From British Birds in their Haunts by Rev. C. A. Johns

Held immovable by the beam it lay upon the floor, a strangely extensile, amoeba-like, metal-studded mass of leathery substance.

From Triplanetary by E. E. (Edward Elmer) Smith