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n pl but sing in constr 1  :  a branch of optics dealing with the refraction of light esp. by lenses  2  :  refractive optics esp. of a lens or system of lenses <correction of refractive error of the peripheral of the eye -Anne Lamont et al>  .
Similar sounding terms:  Dip·ter·yx 

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Buchanan General Hospital (Grundy, Virginia - Buchanan County)