Definition of rutilation in US English:

rutilation

noun

  • 1Literary or technical. A glow, shine, gleam, glitter, of either a reddish or a golden light; the action or fact of glowing, etc., with such a light. Now rare.

  • 2Chiefly Mineralogy. The presence of inclusions of rutile in quartz.

Origin

Mid 17th century; earliest use found in Edward Phillips (b. 1630), writer and biographer. From post-classical Latin rutilation-, rutilatio action of glowing red from classical Latin rutilāt-, past participial stem of rutilāre + -iō.