If you describe something as optic, it has something to do with eyes or vision. Your optic nerve, for example, sends information to your brain from your eyes.

You'll most often find the adjective optic in anatomy or biology textbooks, describing the parts of an eye, or disorders involving the eye. Your optic disc is a tiny blind spot that all humans have on their eyeballs, and optic neuritis is an inflammation of the optic nerve. When it's a noun, optic is an old-fashioned, jokey way to say "eyeball." Optic comes from the Greek optikos, "of or having to do with sight."

Definitions of optic

adj of or relating to or resembling the eye

“the optic (or optical) axis of the eye”
ocular, opthalmic, optical

adj relating to or using sight

ocular, optical, visual

n the organ of sight

eye, oculus
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naked eye
the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects
an informal term referring to the eye
OD, oculus dexter
the right eye
OS, oculus sinister
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
any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
Type 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

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