optic

adj

1. (not-comparable, relational)Of, or relating to the eye or to vision.

   “The moon, whose orb / Through optic glass the Tuscan artist views.”

2. (not-comparable, relational)Of, or relating to optics or optical instruments.

noun

1. (archaic, humorous)An eye.

   “The difference is as great between / The optics seeing, as the object seen.”

   “how they, / Who saw those figures on the margin kiss all, / Could turn their optics to the text and pray, / Is more than I know[…]”

   “Elbows almost touching they leaned at ease, idly reading the almost obliterated lines engraved there. ¶ "I never understood it," she observed, lightly scornful. "What occult meaning has a sun-dial for the spooney? I'm sure I don't want to read riddles in a strange gentleman's optics."”

2. A lens or other part of an optical instrument that interacts with light.

   “The single-imaging optic of the mammalian eye offers some distinct visual advantages. Such lenses can take in photons from a wide range of angles, increasing light sensitivity. They also have high spatial resolution, resolving incoming images in minute detail.”

3. A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar.

   “They were neatly lined up on three shelves between the optics of martini, vodka, whisky and gin.”

   “They pulled up two bar stools and looked around the room as the barman relieved the whisky optic of its contents.”