Source : Webster's Revised Unabridged Dictionary (1913)

Diffract \Dif*fract"\, v. t. [imp. & p. p. {Diffracted}; p. pr.
   & vb. n. {Diffracting}.] [L. diffractus, p. p. of diffringere
   to break in pieces; dif- = dis- + frangere to break. See
   {Fracture}.]
   To break or separate into parts; to deflect, or decompose by
   deflection, a? rays of light.

Source : WordNet®

diffract
     v : undergo diffraction; "laser light diffracts electrons"