Wordnet 3.0
NOUN (1)
1. (anatomy) a fold or wrinkle or crease;
- Example: "rugae of the stomach"
The Collaborative International Dictionary of English v.0.48:
Ruga \Ru"ga\, n.; pl. Rugae. [L.] (Nat. Hist.) A wrinkle; a fold; as, the rugae of the stomach. [1913 Webster]

