[proh-trak-til, -tahyl, pruh-]
capable of being protracted, lengthened, or protruded.

1820–30; protract + -ile

protractility, noun
nonprotractile, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
protractile or (less commonly) protractible (prəˈtræktaɪl)
able to be extended or protruded: protractile muscle
protractible or (less commonly) protractible

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

protractile pro·trac·tile (prō-trāk'təl, -tīl', prə-) or pro·tract·i·ble (-tə-bəl)
That can be protracted; extensible, as of a limb.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They have small protractile mouths and a continuous dorsal fin.
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