/ˈäptik/
Adjective
1. Of, or relating to the eye or to vision. (wiktionary.org)
2. Of, or relating to optics or optical instruments. (wiktionary.org)
Noun
1. A lens or other optical component in an optical instrument. (Google Dictionary)
2. The eye. (Google Dictionary)
Word origin: From Medieval Latin opticus “of sight or seeing,” from Greek optikos “of or having to do with sight,” from optos “seen, visible,” from op-, root of opsesthai “be going to see,” related to ops “eye,”