Definition of ruga in US English:

ruga

noun

Anatomy Botany Zoology
  • A fold, a ridge, a wrinkle. Usually in plural.

Origin

Late 17th century; earliest use found in Philosophical Transactions of the Royal Society of London. From classical Latin rūga crease, small fold, wrinkle, of uncertain origin, perhaps related to Lithuanian raukas wrinkle.

Pronunciation

ruga

/ˈruːɡə/