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“refract” in Latin

The English word refract itself goes back to Latin frangō, through refrāctum.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

refract
infringere: refringere (e.g., radii infracti resiliunt, Plin.): solis radii aquae immissi refringuntur (id., 2, 59, 60).

Quick answer

What is the Latin word for refract?
The usual Latin words for “refract” are īnfringō, refringō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.