rugae
pronunciation
How to pronounce rugae in British English:
UK 
How to pronounce rugae in American English:
US
Word Origin
- rugae (n.)
- 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.)).