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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for rugae
Historical Examples of rugae
This section of the colon is lined with rugae precisely like those which are found in the caecum.The Cambridge Natural History, Vol X., Mammalia
Frank Evers Beddard
noun plural -gae (-dʒiː)
(usually plural) anatomy a fold, wrinkle, or crease
Word Origin for ruga
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
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
n. pl. ru•gae (-gē′, -gī′)
A fold, crease, or wrinkle, as in the lining of the stomach. Often used in the plural.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.