1. Of or relating to the eye or vision.
2. Of or relating to the science of optics or optical equipment.
1. An eye.
2. Any of the lenses, prisms, or mirrors of an optical instrument.
[Middle English optik, from Old French optique, from Medieval Latin opticus, from Greek optikos, from optos, visible; see okw- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.