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The Collaborative International Dictionary
Rugae

Ruga \Ru"ga\, n.; pl. Rug[ae]. [L.] (Nat. Hist.) A wrinkle; a fold; as, the rug[ae] of the stomach.

Douglas Harper's Etymology Dictionary
rugae

plural of ruga (1775), from Latin ruga "a wrinkle in the face," from PIE *rug-, variant of *reue- (2) "to smash, knock down, tear up, dig up, uproot" (see rough (adj.)).

Wiktionary
rugae

n. (plural of ruga English)

WordNet
ruga
  1. n. (anatomy) a fold or wrinkle or crease; "rugae of the stomach"

  2. [also: rugae (pl)]

rugae

See ruga

Wikipedia
Rugae

Rugae is a term used in anatomy that refers to a series of ridges produced by folding of the wall of an organ. Most commonly the term is applied to the internal surface of the stomach ( gastric rugae).