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n. pl. oc·u·li (-lī′) Architecture
An eyelike opening or ornament, especially:
a. A round window.
b. A circular opening at the apex of a dome.

[Medieval Latin, from Latin, eye; see okw- in Indo-European roots.]


1. (Botany) botany the leaf bud or beginnings of a leaf in a plant
2. (Architecture) architect a circular aperture
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.oculus - the organ of sightoculus - the organ of sight      
sense organ, sensory receptor, receptor - an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
visual system - the sensory system for vision
naked eye - the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects; "it is not safe to look directly at the sun with the naked eye"
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
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
ciliary body - the part of the tunic of the eye between the choroid coat and the iris; "the ciliary body produces aqueous humor"
eyelid, lid, palpebra - either of two folds of skin that can be moved to cover or open the eye; "his lids would stay open no longer"
canthus - either of the corners of the eye where the upper and lower eyelids meet
epicanthic fold, epicanthus - a vertical fold of skin over the nasal canthus; normal for Mongolian peoples; sometimes occurs in Down's syndrome
nictitating membrane, third eyelid - a protective fold of skin in the eyes of reptiles and birds and some mammals
conjunctiva - a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid
eyeball, orb - the ball-shaped capsule containing the vertebrate eye
eye muscle, ocular muscle - one of the small muscles of the eye that serve to rotate the eyeball
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
uvea - the part of the eye that contains the iris and ciliary body and choroid
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 of the eye, lens - biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses 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
face, human face - the front of the human head from the forehead to the chin and ear to ear; "he washed his face"; "I wish I had seen the look on his face when he got the news"
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
aperture - a natural opening in something
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