eye

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An organ of vision or of light sensitivity.
• noun Either of a pair of hollow structures located in bony sockets of the skull, functioning together or independently, each having a lens capable of focusing incident light on an internal photosensitive retina from which nerve impulses are sent to the brain; the vertebrate organ of vision.
• noun The external, visible portion of this organ together with its associated structures, especially the eyelids, eyelashes, and eyebrows.
• noun The pigmented iris of this organ.
• noun The faculty of seeing; vision.
• noun The ability to make intellectual or aesthetic judgments.
• noun A way of regarding something; a point of view.
• noun Attention.
• noun Watchful attention or supervision.
• noun Something suggestive of the vertebrate organ of vision, especially.
• noun An opening in a needle.
• noun The aperture of a camera.
• noun A loop, as of metal, rope, or thread.
• noun A circular marking on a peacock's feather.
• noun Chiefly Southern US The round flat cover over the hole on the top of a wood-burning stove.
• noun A photosensitive device, such as a photoelectric cell.
• noun A bud on a twig or tuber.
• noun The often differently colored center of the corolla of some flowers.
• noun Meteorology The circular area of relative calm at the center of a cyclone.
• noun The center or focal point of attention or action.
• noun Informal A detective, especially a private investigator.
• noun A choice center cut of meat, as of beef.
• transitive verb To look at.
• transitive verb To watch closely.
• transitive verb To supply with an eye.
• idiom (all eyes) Fully attentive.
• idiom (an eye for an eye) Punishment in which an offender suffers what the victim has suffered.
• idiom (clap/lay) /set) To look at.
• idiom (eye to eye) In agreement.
• idiom (have eyes for) To be interested in.
• idiom (have (one's) eye on) To look at, especially attentively or continuously.
• idiom (have (one's) eye on) To have as one's objective.
• idiom (in the eye of the wind) In a direction opposite that of the wind; close to the wind.
• idiom (in the public eye) Frequently seen in public or in the media.
• idiom (in the public eye) Widely publicized; well-known.
• idiom (my eye) In no way; not at all. Used interjectionally.
• idiom (with an eye to) With a view to.
• idiom (with (one's) eyes closed) Unaware of the risks involved.
• idiom (with (one's) eyes open) Aware of the risks involved.

from The Century Dictionary.

• To fix the eye on; look at; view; observe; particularly, to observe or watch narrowly or with fixed attention.
• To make an eye in: as, to eye a needle.
• To be seen; appear; have an appearance.
• noun A brood: as, an eye or a shoal of fish.
• noun In some echinoids, a minute pigmented nodule, probably without visual functions, situated at the end of an ambulacrum.
• noun In photography, the spectral range of wave-lengths to which a photographic plate or film is sensitive