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a doubling over or a tuck (of the skin, muscle wall, etc)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdu plɪ kəˌtʃʊər, -kə tʃər, -ˌkeɪ tʃər, ˈdyu-)

a folding or doubling of a part on itself, as a membrane.
[1680–90; < New Latin duplicātūra. See duplicate, -ure]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Sporadic endolymphatic sac tumor is a very rare neoplasm derived from the endolymphatic sac, a part of the inner ear located in the dural duplicature in the posterior cranial fossa behind and medial to the labyrinth.
In Ostracoda ontogenetic changes are also seen in the increasing complexity of hinge, duplicature (calcification becomes broader), marginal pore canals and in the pattern of muscle scars (early larval stages of some genera have a smaller number of muscle scars than the later larval stages and adults).