[], (Adjective)

Definitions:
- Characterized by wrinkles or ridges; wrinkled.

- Of a filter, coating, etc.: having a refractive index which varies smoothly in a regular, typically sinusoidal, manner with depth.


Phrases:

Origin:
mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From classical Latin rūgātus having a wrinkled surface from rūga + -ātus