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 refering 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

ciliary body - the part of the tunic of the eye between the choroid coat and the iris

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 membrane covering the eyeball and 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 - transparent anterior portion of the outer covering of the eye; it covers the lens and iris and is continuous with the sclera

uvea - the part of the eye that contains the iris and ciliary body and choroid

iris - muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye

crystalline lens, lens - biconvex transparent body situated behind the iris in the eye; it focuses light waves 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 light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve

sclera, sclerotic coat - whitish fibrous membrane (albuginea) that with the cornea forms the outer covering 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

sagaciousness, sagacity, discernment, judgement, judgment - ability to make good judgments

attending, attention - the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others

area, country - a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography); "it was a mountainous area"; "Bible country"

center stage, centre stage - the central area on a theater stage

central city, city center, city centre - the central part of a city

storm centre, storm center - the central area or place of lowest barometric pressure within a storm

financial center - the part of a city where financial institutions are centered

hub - a center of activity or interest or commerce or transportation; a focal point around which events revolve; "the playground is the hub of parental supervision"; "the airport is the economic hub of the area"

inner city - the older and more populated and (usually) poorer central section of a city

medical center - the part of a city where medical facilities are centered

midfield - (sports) the middle part of a playing field (as in football or lacrosse)

seat - a center of authority (as a city from which authority is exercised)

City of London, the City - the part of London situated within the ancient boundaries; the commercial and financial center of London

midstream - the middle of a stream

hole - an opening deliberately made in or through something

needle - a sharp pointed implement (usually steel)

look - perceive with attention; direct one's gaze towards; "She looked over the expanse of land"; "Look at your child!"; "Look--a deer in the backyard!"