Artificial intelligent assistant

refracter

† reˈfracter Obs.
  [f. refract v. + -er1.]
  = refractor 3 b.

1761 Hirst in Phil. Trans. LII. 397 A 4 feet refracter, of Mr. Dollond's new construction. 1763 Short ibid. LIII. 341 He used an 18 foot refracter.

Oxford English Dictionary

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