noun, plural ru·gae [roo-jee, -gee] /ˈru dʒi, -gi/.

Usually rugae. Biology, Anatomy. a wrinkle, fold, or ridge.

Origin of ruga

First recorded in 1765–75, ruga is from the Latin word rūga Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rugae

Historical Examples of rugae

British Dictionary definitions for rugae


noun plural -gae (-dʒiː)

(usually plural) anatomy a fold, wrinkle, or crease

Word Origin for ruga

C18: Latin
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

Word Origin and History for rugae

plural of ruga (1775), from Latin ruga "a wrinkle in the face," from PIE *rug-, variant of *reue- (see rough (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for rugae



n. pl. ru•gae (-gē′, -gī′)

A fold, crease, or wrinkle, as in the lining of the stomach. Often used in the plural.
Related formsrugate′ (-gāt′) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.