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[roo-guh] /ˈru gə/
noun, plural rugae
[roo-jee, -gee] /ˈru dʒi, -gi/ (Show IPA)
Usually, rugae. Biology, Anatomy. a wrinkle, fold, or ridge.
Origin of ruga
1765-75; < Latin rūga Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for rugae
  • The rugae enlarge because of an overgrowth of surface mucous cells of the stomach.
  • When the bladder is empty, the mucosa has numerous folds called rugae.
  • The rugae and transitional epithelium allow the bladder to expand as it fills.
  • In cattle the intestinal wall becomes thickened and has transverse folds called rugae.
  • Carapace slightly longer than wide, with transverse ciliated rugae.
British Dictionary definitions for rugae


noun (pl) -gae (-dʒiː)
(usually pl) (anatomy) a fold, wrinkle, or crease
Word Origin
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
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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
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rugae in Medicine

ruga ru·ga (rōō'gə)
n. pl. ru·gae (-gē', -gī')
A fold, crease, or wrinkle, as in the lining of the stomach. Often used in the plural.

ru'gate' (-gāt') adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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