Rugate

//ˈɹuːɡeɪt// adj

Definitions

Adjective
  1. 1
    Having alternate ridges and depressions; wrinkled.

    "Unifacial, superior surface transversely rugate, with minute oririmes at the bottom of the furrows"

  2. 2
    Having a varying refractive index.

    "Rugate coatings typically consist of a single layer deposited onto a substrate where the refractive index of the layer continuously changes as a function of depth."

Etymology

From Latin rugatus, past participle of rugare (“to wrinkle”), from ruga (“a wrinkle”).

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