
1) Anatomical ridge 2) Anatomical wrinkle 3) Fold 4) Plica
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https://www.crosswordclues.com/clue/ruga

Latin, meaning: a wrinkle.
Found on
http://archives.nd.edu/rrr.htm

• (n.) A wrinkle; a fold; as, the rugae of the stomach.
Found on
http://thinkexist.com/dictionary/meaning/ruga/

(roo´gә) Latin word meaning ridge, wrinkle, or fold; a term used in anatomy.
Found on
http://www.encyclo.co.uk/local/21001
Ru'ga noun ;
plural Rugæ . [ Latin ]
(Nat. Hist.) A wrinkle; a fold; as, the
rugæ of the stomach.
Found on
http://www.encyclo.co.uk/webster/R/103

Type: Term Pronunciation: rū′gă, rū′jē Definitions: 1. A fold, ridge, or crease; a wrinkle.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=79146

[
n] - (anatomy) a fold or wrinkle or crease
Found on
http://www.webdictionary.co.uk/definition.php?query=ruga

ruga (s), rugae (pl) A fold, crease, ridge, or wrinkle; for example, mucous membrane.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1874/
noun (anatomy) a fold or wrinkle or crease; `rugae of the stomach`
Found on
https://www.encyclo.co.uk/local/20974

Latin = a wrinkle.
Found on
https://www.encyclo.co.uk/local/21450

Usually,a wrinkle, fold, or ridge.
Found on
https://www.infoplease.com/dictionary/ruga
No exact match found.