1. An organ of sight.

2. Relating or pertaining to vision, or to optics. Optic nerves, the second pair of nerves arising from the thalami nervorum, and perforating the bulb of the eye. Optical delusions, erroneous impressions sometimes conveyed through the organs of vision to the mind. Optic lens, a ground glass for a telescope or other optical instrument.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• ceptic,
• eppic,
• opaid,
• optican,
• myoptic,
• optain,
• apric,
• optio,
• uptil,
• ehtic,
• opick,
• spetic,
• opic,
• aptil,
• sptic,
• optin,
• opratic,
• heptic,
• optik,
• cyptic

• optician,
• optical,
• optics,
• Opitz.

The adjective form of the word "optic" is "optical".

The plural form of the word "optic" is "optics"

The singular form of the word "optic" is "optic". It remains the same in both singular and plural forms.