Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Of or relating to the eye or vision.
- adjective Of or relating to the science of optics or optical equipment.
- noun An eye.
- noun Any of the lenses, prisms, or mirrors of an optical instrument.
from The Century Dictionary.
- Relating or pertaining to vision or sight; visual; subservient to the faculty or function of seeing.
- Of or pertaining to the eye as the organ of vision; ocular; ophthalmic.
- Relating to the science of optics.
- The angle which the visual axes of the eyes make with one another as they tend to meet at some distance before the eyes.
- The angle between the optic axes in a biaxial crystal.
- The line in a doubly refracting crystal in the direction of which no double refraction occurs. Crystals belonging to the tetragonal and hexagonal systems have a single optic axis, coincident with their vertical crystallographical axis: hence they are said to be uniaxial. Crystals belonging to the orthorhombic, monoclinic, and triclinic systems have two optic axes, and hence are biaxial.
- Synonyms Optic, Optical. The former is chiefly said of the anatomy of the eye and of the physiology of vision, the latter chiefly of the science of optics: as, optic nerve, tract, lobe; optical angle, center, effect.
- noun The eye.
- noun An eye-glass; a magnifying glass.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Of, pertaining to, or using vision or sight.
- adjective Of or pertaining to the eye; ocular. See
Illust. ofBrain , andEye . - adjective Relating to the science of optics or to devices designed to assist vision.
- adjective (Opt.) the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called
binocular parallax . - adjective (Opt.) 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.
- adjective (Opt.) a graduated circle used for the measurement of angles in optical experiments.
- adjective a surveyor's instrument with reflectors for laying off right angles.
- noun The organ of sight; an eye.
- noun obsolete An eyeglass.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Of, or relating to the
eye or tovision . - adjective Of, or relating to
optics oroptical instruments . - noun An
eye . - noun A
lens or other part of anoptical instrument thatinteracts withlight . - noun A
measuring device with a smallwindow , attached to anupside-down bottle , used todispense alcoholic drinks in abar .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective relating to or using sight
- noun the organ of sight
- adjective of or relating to or resembling the eye
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The second pair are the optic nerves, which, under the name of the _optic tracts_, run down to the base of the brain, from which an optic nerve passes to each eyeball.
A Practical Physiology Albert F. Blaisdell
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In fishes, reptiles, and birds they are hollow, and only two in number (corpora bigemina); they represent the superior colliculi of mammals, and are frequently termed the optic lobes, because of their intimate connection with the optic tracts.
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McConnell enlisted in the Army Reserve in July 1967 at the height of the Vietnam War but received a medical discharge after less than six months for an eye condition called optic neuritis, according to limited information that has been made public.
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The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed — the olfactory lobes, the cerebral hemisphere, and the succeeding divisions — no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
Essays 2007
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The midbrain bears swellings that are particularly concerned with the sense of sight and are therefore termed the optic lobes ( "sight" G).
The Human Brain Asimov, Isaac 1963
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These diverticula make their appearance before the closure of the anterior end of the neural tube; after the closure of the tube they are known as the optic vesicles.
X. The Organs of the Senses and the Common Integument. 1c. The Organ of Sight 1918
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For example, if a dog be deprived of one hemisphere, the eye which was supplied from it with nerve-fibres continues able to see, or to transmit impressions to the lower nerve-centre called the optic ganglion; for this eye will then mechanically follow the hand waved in front of it.
Mind and Motion and Monism George John Romanes 1871
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The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed -- the olfactory lobes, the cerebral hemisphere, and the succeeding divisions -- no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
On the Relations of Man to the Lower Animals Thomas Henry Huxley 1860
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The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed -- the olfactory lobes, the cerebral hemisphere, and the succeeding divisions -- no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
Lectures and Essays Thomas Henry Huxley 1860
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In fact, the ganglionic corpuscles of each eye may be considered as constituting a little brain, connected with the masses behind by the commissure, commonly called the optic nerve.
Medical Essays, 1842-1882 Oliver Wendell Holmes 1851
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