protractile

adjective
pro·​trac·​tile | \ prō-ˈtrak-tᵊl How to pronounce protractile (audio) , -ˌtī(-ə)l, prə-\

Definition of protractile

: capable of being thrust out protractile jaws

First Known Use of protractile

1828, in the meaning defined above

History and Etymology for protractile

Latin protractus

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The first known use of protractile was in 1828

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