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optical |
2 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Optic \Op"tic\, Optical \Op"tic*al\, a. [F. optique Gr ?; akin to ? sight, ? I have seen, ? I shall see and to ? the two eyes, ? face, L. oculus eye. See {Ocular}, {Eye}, and cf {Canopy}, {Ophthalmia}.] 1. Of or pertaining to vision or sight. The moon, whose orb Through optic glass the Tuscan artist views. --Milton. 2. Of or pertaining to the eye; ocular; as the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of {Brain}, and {Eye}. 3. Relating to the science of optics; as optical works {Optic angle} (Opt.), the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called {binocular parallax}. {Optic axis}. (Opt.) a A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. b The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line a biaxial crystal has two {Optical circle} (Opt.), a graduated circle used for the measurement of angles in optical experiments. {Optical square}, a surveyor's instrument with reflectors for laying off right angles. From WordNet r 1.6 [wn]: optical adj 1: of or relating to or involving optics; "optical supplies 2: relating to or using sight; "ocular inspection"; "an optical illusion"; "visual powers"; "visual navigation" [syn: {ocular}, {optic}, {visual}] 3: of or relating to or resembling the eye; "ocular muscles"; "an ocular organ"; "ocular diseases"; "the optic (or optical) axis of the eye"; "an ocular spot is a pigmented organ or part believed to be sensitive to light" [syn: {ocular}, {optic}, {opthalmic}]
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