11 letters · 20 points in Scrabble
noun when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands
originFrom New Latin diffrāctiō (in which coined by Francesco Maria Grimaldi), from Latin diffrāctus, past participle of Latin diffringo (“to shatter, to break into pieces”). Coined in Physico-mathesis de lumine (1665) by Francesco Maria Grimaldi.
Etymology from Wiktionary, CC BY-SA 3.0