Noun, pl. eyes
1. The organ of sight or vision; the visual sense; the sense of seeing. (biology-online.org)
2. An organ that is sensitive to light, which it converts to electrical signals passed to the brain, by which means animals see. (wiktionary.org)
3. An organ of sight; especially : a nearly spherical hollow organ that is lined with a sensitive retina, is lodged in a bony orbit in the skull, is the vertebrate organ of sight, and is normally paired. (merriam-webster.com)
4. A mark resembling the organ of sight in form, position or appearance, as the spot on the feather of a peacock or the spot on the wings of a butterfly, or the dark spot in a black-eyed pea. (biology-online.org)
5. The scar to which the adductor muscle (or the adductor muscle itself) is attached in oysters and some bivalve shells. (biology-online.org)
6. The bud or sprout of a plant or tuber, as the reproductive bud of a potato. (biology-online.org)
7. The action of the organ of sight; view. (biology-online.org)
8. The scope of vision. (biology-online.org)
9. The center of a target. (biology-online.org)
Word origin: from Old English ege (Mercian), eage (West Saxon), from Proto-Germanic *augon (cf. Old Saxon aga, Old Frisian age, Old Norse auga, Swedish öga, Danish øie, Middle Dutch oghe, Dutch oog, Old High German ouga, German Auge, Gothic augo “eye”), from PIE *okw- “to see” (cf. Sanskrit akshi “the eye, the number two,” Greek opsis “a sight,” Old Church Slavonic oko, Lithuanian akis, Latin oculus, Greek okkos, Tocharian ak, ek, Armenian akn).