an ornamental lining of a book cover.
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How to use doublure in a sentence
doublure, the inside face of the boards, especially applied to them when lined with leather and decorated.Bookbinding, and the Care of Books | Douglas Cockerell
Width of doublure of front of cephalon on median line, 17 mm.; length of hypostoma, 20 mm.
Since the front of the hypostoma is attached to this doublure, it stands high up within the vault and under the glabella.
They occur near the anterior margin of the segment, and near the inner end of the doublure.
It is also known that the epistoma is narrower and more firmly fused into the doublure in later than in earlier species.
British Dictionary definitions for doublure
a decorative lining of vellum or leather, etc, on the inside of a book cover
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012