One of the mysteries of the English language finally explained.
1Botany and Zoology. Characterized by wrinkles or ridges; wrinkled.
2Optics. Of a filter, coating, etc.: having a refractive index which varies smoothly in a regular, typically sinusoidal, manner with depth.
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.
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