GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Optic , n. [From Optic, a.]
   The organ of sight; an eye.
   1913 Webster
   The difference is as great between
   The optics seeing, as the object seen.
   Pope.
   
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   An eyeglass. [Obs.]
   Herbert.
   
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2.       
   { Optic , Optical , } a. [F. optique, Gr. ὀπτικός; akin to ὄψις sight, ὄπωπα I have seen, ὄψομαι I shall see, and to ὄσσε the two eyes, ὄψ face, L. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.]
   Of, pertaining to, or using vision or sight; as, optical illusions. [wns=2]
   Syn. -- ocular, optic, visual.
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    + 
   WordNet 1.5
   The moon, whose orb
   Through optic glass the Tuscan artist views.
   Milton.
   
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   Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye. [wns=3]
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   Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. [wns=1]
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   +PJC
   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.
   1913 Webster