protractile

Protrud′able, Protru′sile, protractile; Protru′sible, able to be protruded.—n.

From Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) by Various

The intermaxillaries are moderately protractile, and curve a little downwards.

From Discoveries in Australia, Volume 1. With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative Of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. by Stokes, John Lort

The intermaxillaries are moderately protractile, but the lower jaw, when depressed, projects still further forward.

From Discoveries in Australia, Volume 1. With an Account of the Coasts and Rivers Explored and Surveyed During The Voyage of H.M.S. Beagle, in the Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners of the Admiralty. Also a Narrative Of Captain Owen Stanley's Visits to the Islands in the Arafura Sea. by Stokes, John Lort