1literary, technical, rare A glow, shine, gleam, glitter, of either a reddish or a golden light; the action or fact of glowing, etc., with such a light.
The presence of inclusions of rutile in quartz.
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.