Optic

• POS: Adjective, Noun
• HYPHEN: op=tic

CIDE DICTIONARY

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."  [1913 Webster]
•  An eyeglass.  Herbert.  [1913 Webster]

Optic, a. [F. optique, Gr. 'optiko`s; akin to 'o`psis sight, 'o`pwpa I have seen, 'o`psomai I shall see, and to 'o`sse the two eyes, 'o`ps face, L. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.].

•  Of, pertaining to, or using vision or sight; as, optical illusions.  [1913 Webster]

  "The moon, whose orb
  Through optic glass the Tuscan artist views."  [1913 Webster]
•  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.  [1913 Webster]
•  Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment.  [1913 Webster]

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.

OXFORD DICTIONARY

Optic, adj. & n.
--adj. of or relating to the eye or vision (optic nerve).
--n.
1 a lens etc. in an optical instrument.
2 archaic or joc. the eye.
3 (Optic) Brit. propr. a device fastened to the neck of a bottle for measuring out spirits etc.

Idiom

optic angle the angle formed by notional lines from the extremities of an object to the eye, or by lines from the eyes to a given point. optic axis
1 a line passing through the centre of curvature of a lens or spherical mirror and parallel to the axis of symmetry.
2 the direction in a doubly refracting crystal for which no double refraction occurs. optic lobe the dorsal lobe in the brain from which the optic nerve arises.

Etymology

F optique or med.L opticus f. Gk optikos f. optos seen

THESAURUS

Optic

baby blues, banjo eyes, bright eyes, clear eyes, cornea, eye, eyeball, eyelid, goggle eyes, iris, lens, lid, naked eye, nictitating membrane, ocular, oculus, ophthalmic, ophthalmologic, optic nerve, optical, optometrical, orb, organ of vision, peeper, popeyes, pupil, retina, saucer eyes, sclera, seeing, starry orbs, unaided eye, visible, visional, visual, visual organ

ROGET THESAURUS

Optic

Vision

N vision, sight, optics, eyesight, view, look, espial, glance, ken, coup d'oeil, glimpse, glint, peep, gaze, stare, leer, perlustration, contemplation, conspection, conspectuity, regard, survey, introspection, reconnaissance, speculation, watch, espionage, espionnage, autopsy, ocular inspection, ocular demonstration, sight-seeing, point of view, gazebo, loophole, belvedere, watchtower, field of view, theater, amphitheater, arena, vista, horizon, commanding view, bird's eye view, periscope, visual organ, organ of vision, eye, naked eye, unassisted eye, retina, pupil, iris, cornea, white, optics, orbs, saucer eyes, goggle eyes, gooseberry eyes, short sight, clear sight, sharp sight, quick sight, eagle sight, piercing sight, penetrating sight, clear glance, sharp glance, quick glance, eagle glance, piercing glance, penetrating glance, clear eye, sharp eye, quick eye, eagle eye, piercing eye, penetrating eye, perspicacity, discernment, catopsis, eagle, hawk, cat, lynx, Argus, evil eye, basilisk, cockatrice, seeing, visual, ocular, optic, optical, ophthalmic, clear-eyesighted, eagle-eyed, hawk-eyed, lynx-eyed, keen- eyed, Argus-eyed, visible, visibly, in sight of, with one's eyes open at sight, at first sight, at a glance, at the first blush, prima facie, Int, look!, the scales falling from one's eyes, an eye like Mars to threaten or command, her eyes are homes of silent prayer, looking before and after, thy rapt soul sitting in thine eyes.