Etymology
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Words related to *okw-

amblyopia (n.)

1706, "weakening of the eyesight without any apparent defect in the eyes," medical Latin, from Greek amblyopia "dim-sightedness," noun of action from amblys "dulled, blunt" (from a suffixed form of PIE root *mel- (1) "soft") + ōps "eye" (from PIE root *okw- "to see") + abstract noun ending -ia. Related: Amblyopic.

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antique (adj.)

1530s, "aged, venerable;" 1540s, "having existed in ancient times," from French antique "old" (14c.), from Latin antiquus (later anticus) "ancient, former, of olden times; old, long in existence, aged; venerable; old-fashioned," from PIE *anti- "before" (from root *ant- "front, forehead," with derivatives meaning "in front of, before") + *okw- "appearance" (from PIE root *okw- "to see").

Originally pronounced in English like its doublet antic, but French pronunciation and spelling were adopted in English from c. 1700. Meaning "not modern" is from 1640s. Related: Antiqueness.

antler (n.)
late 14c., "first tine or branch of the horns of a deer," from Anglo-French auntiler, Old French antoillier (14c., Modern French andouiller) "antler," which is perhaps from Gallo-Roman cornu *antoculare "horn in front of the eyes," from Latin ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + ocularis "of the eyes" (from Latin oculus "an eye," from PIE root *okw- "to see").

This etymology is doubted by some because no similar word exists in any other Romance language, but compare German Augensprossen "antlers," literally "eye-sprouts," for a similar formation. Later used of any branch of the horns. Related: Antlered (1813).
atrocity (n.)

1530s, "enormous wickedness," from French atrocité or directly from Latin atrocitatem (nominative atrocitas) "cruelty, fierceness, harshness," noun of quality from atrox "fierce, cruel, frightful," from PIE *atro-ek-, from root *ater- "fire" + root *okw- "to see;" thus "of fiery or threatening appearance." The meaning "an atrocious deed" is from 1793.

autopsy (n.)

1650s, "an eye-witnessing, a seeing for oneself," from Modern Latin autopsia, from Greek autopsia "a seeing with one's own eyes," from autos- "self" (see auto-) + opsis "a sight" (from PIE root *okw- "to see"). Sense of "dissection of a body to determine cause of death" is first recorded 1670s, probably from the same sense in French autopsie (1570s). Related: Autopsic; autoptic. As a verb by 1895.

binocle (n.)
"telescope or opera glass with two tubes for use by both eyes at once," 1690s, from French binocle (17c.), from Latin bini- "two by two, twofold, two apiece" (see binary) + oculus "eye" (from PIE root *okw- "to see").
binocular (adj.)
1738, "involving both eyes," earlier "having two eyes" (1713), from French binoculaire, from Latin bini "two by two, twofold, two apiece" (see binary) + ocularis "of the eye," from oculus "eye" (from PIE root *okw- "to see"). The double-tubed telescopic instrument (1871, short for binocular glass) earlier was called a binocle. Related: Binocularity; binocularly.
biopsy (n.)
"examination of tissue removed from a living body," 1895, from French biopsie, coined by French dermatologist Ernest Besnier (1831-1909) from Greek bi-, combining form of bios "life" (from PIE root *gwei- "to live") + opsis "a sight" (from PIE root *okw- "to see"). As a verb, from 1964.
catoptric (adj.)
"pertaining to mirrors or a mirror," 1774, from Latinized form of Greek katoptrikos, from katoptron "mirror," from kata "against" (see cata-) + stem of optos "seen, visible" (from PIE root *okw- "to see") + instrumental suffix -tron. Related: Catoptrics; catoptrical.
Cyclops (n.)

(plural Cyclopes), in Greek mythology, a giant with one eye, circular and in the middle of the forehead, 1510s, from Latin Cyclops, from Greek kyklops, literally "round-eyed," from stem of kyklos "circle, circular body" (from PIE root *kwel- (1) "revolve, move round") + ops "eye" (from PIE root *okw- "to see").

According to the Hesiodic legend, there were three Cyclopes of the race of Titans, sons of Uranus and Ge, who forged the thunderbolts of Zeus, Pluto's helmet, and Poseidon's trident, and were considered the primeval patrons of all smiths. Their workshops were afterward said to be under Mount Etna. [Century Dictionary]

But in the Odyssey they were lawless gigantic cannibal shepherds in Sicily under their chief Polyphemus, and in other ancient tales they were race of giants from Thrace under a king Cyclops, who built the prehistoric walls and fortresses of Greece. Related: Cyclopic.