| / English Dictionary |
OPTIC
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
The organ of sight
Synonyms:
Classified under:
Hypernyms ("optic" is a kind of...):
receptor; sense organ; sensory receptor (an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation)
Meronyms (parts of "optic"):
uveoscleral pathway (a tubule that drains excess aqueous humor)
iris (muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye)
crystalline lens; lens; lens of the eye (biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focus light on the retina)
arteria centralis retinae; central artery of the retina (a branch of the ophthalmic artery; enters the eyeball with the optic nerve)
arteria ciliaris; ciliary artery (one of several arteries supplying the choroid coat of the eye)
arteria lacrimalis; lacrimal artery (an artery that originates from the ophthalmic artery and supplies the lacrimal gland and rectal eye muscles and the upper eyelid and the forehead)
lacrimal vein; vena lacrimalis (drains the lacrimal gland; empties into the superior ophthalmic vein)
lacrimal apparatus (the structures that secrete and drain tears from the eye)
retina (the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve)
sclera; sclerotic coat (the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball)
musculus sphincter pupillae; pupillary sphincter (a ring of smooth muscle surrounding the iris)
aperture (a natural opening in something)
uvea (the part of the eye that contains the iris and ciliary body and choroid)
cornea (the transparent dome-shaped anterior portion of the outer covering of the eye; it covers the iris and pupil and is continuous with the sclera)
eye muscle; ocular muscle (one of the small muscles of the eye that serve to rotate the eyeball)
eyeball; orb (the ball-shaped capsule containing the vertebrate eye)
conjunctiva (a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid)
nictitating membrane; third eyelid (a protective fold of skin in the eyes of reptiles and birds and some mammals)
epicanthic fold; epicanthus (a vertical fold of skin over the nasal canthus; typical for many east Asian peoples; sometimes occurs in Down's syndrome)
canthus (either of the corners of the eye where the upper and lower eyelids meet)
eyelid; lid; palpebra (either of two folds of skin that can be moved to cover or open the eye)
ciliary body (the part of the tunic of the eye between the choroid coat and the iris)
choroid; choroid coat (a highly vascular membrane in the eye between the retina and the sclera; a dark pigmentation minimizes the scattering of light inside the eye)
Domain usage:
colloquialism (a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech)
Hyponyms (each of the following is a kind of "optic"):
naked eye (the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects)
peeper (an informal term referring to the eye)
oculus dexter; OD (the right eye)
oculus sinister; OS (the left eye)
ocellus; simple eye; stemma (an eye having a single lens)
compound eye (in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an image)
Holonyms ("optic" is a part of...):
visual system (the sensory system for vision)
face; human face (the front of the human head from the forehead to the chin and ear to ear)
Derivation:
optic (relating to or using sight)
II. (adjective)
Sense 1
Meaning:
Relating to or using sight
Example:
visual navigation
Synonyms:
ocular; optic; optical; visual
Classified under:
Relational adjectives (pertainyms)
Pertainym:
sight (the ability to see; the visual faculty)
Derivation:
optic (the organ of sight)
Sense 2
Meaning:
Of or relating to or resembling the eye
Example:
ophthalmic defect
Synonyms:
ocular; ophthalmic; optic; optical
Classified under:
Relational adjectives (pertainyms)
Pertainym:
eye (the organ of sight)
Context examples:
A congenital abnormality characterized by the underdevelopment of the optic nerve.
(Optic Nerve Hypoplasia, NCI Thesaurus)
It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve.
(Optic Disc, NLM, Medical Subject Headings)
An anatomic structure formed by the crossing of the two optic nerves under the hypothalamus.
(Optic chiasm, NCI Thesaurus)
The components of the eye that are also part of the nervous system, including the retina and optic nerve.
(Murine Neuro-Ocular System, NCI Thesaurus)
The optic nerve conveys visual information from the retina to the brain.
(Murine Optic Nerve, NLM, Medical Subject Headings)
Atrophy of the optic disk which may be congenital or acquired.
(Optic Atrophy, NLM, Medical Subject Headings)
The place in the brain where some of the optic nerve fibers coming from one eye cross optic nerve fibers from the other eye.
(Optic chiasm, NCI Dictionary)
A device consisting of a tube containing flexible optic fibers that may be inserted into a body opening to allow a doctor to examine hollow organs inside the body.
(Endoscope, NCI Thesaurus)
Six participants were unable to detect any light, either because their optic nerves had been damaged or their eyes removed due to disease.
(How Light Boosts Migraine Pain, NIH, US)
Scientists had suspected that oxidative stress might contribute to the degeneration of the optic nerve, but until now lacked evidence.
(Glaucoma-related genes revealed, NIH)
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