11 letters · 18 points in Scrabble
noun the fraction of radiant energy that is reflected from a surface
originEtymology tree English reflect Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -iader. Old French -ancebor. Middle English -aunce English -ance English reflectance From reflect + -ance.
Etymology from Wiktionary, CC BY-SA 3.0