refraction
n.
1570s, from Late Latin refractionem (nominative refractio) "a breaking up," noun of action from past participle stem of Latin refringere "to break up," from re- "back" (see re-) + comb. form of frangere "to break" (see fraction).
〔蒋〕[frag，fract破，折，-ion名词后缀] 折射，折射度