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n. pl. ru·gae (-gē′, -gī′) Biology
often rugas A fold, crease, or wrinkle, as in the lining of the stomach.

[Latin rūga.]

ru′gate′ (-gāt′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -gae (-dʒiː)
(Anatomy) (usually plural) anatomy a fold, wrinkle, or crease
[C18: Latin]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈru gə)

n., pl. -gae (-jē, -gē).
Usu., rugae. Anat. a wrinkle, fold, or ridge.
[1765–75; < Latin rūga]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ruga - (anatomy) a fold or wrinkle or crease; "rugae of the stomach"
plica, fold - a folded part (as in skin or muscle)
anatomy, general anatomy - the branch of morphology that deals with the structure of animals
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References in periodicals archive ?
Abbreviations: d1 = diastemal ruga 1; d2 = diastemal ruga 2; d3 = diastemal ruga 3; in = incisor; M1 = first upper molar; r1 = palatal ruga 1; r2 = palatal ruga 2; r3 = palatal ruga 3; r4 = palatal ruga 4.
J., "The palatal ruga pattern: a new classification," The Journal of the Dental Association of South Africa, vol.
Lysell as well as Sassouni [17] (1957), believed that, in general, the palatal ruga are unchanged throughout life, but found that this does not apply in every aspect.