/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. (now humorous) An eye. (wiktionary.org)
2. A lens or other part of an optical instrument that interacts with light. (wiktionary.org)
3. A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar. (wiktionary.org)
Word origin: From Middle French optique, obtique (c.1300) and directly 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.”