10 letters · 18 points in Scrabble
adjective of or relating to or capable of refraction
adjective capable of changing the direction (of a light or sound wave)
originEtymology tree English refract Proto-Indo-European *-wós Proto-Indo-European *-iHwósder. Latin -īvus Old French -ifbor. Middle English -yf English -ive English refractive From refract + -ive.
Etymology from Wiktionary, CC BY-SA 3.0