Etymology
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eyeball (n.)

also eye-ball, "the ball or globe of the eye," so called for its shape, 1580s, from eye (n.) + ball (n.1), which is attested from c. 1400 in the sense "spherical structure of the eye." As a verb, 1901, American English slang. Related: Eyeballed; eyeballing.

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ophthalmo- 

before vowels ophthalm-, word-forming element meaning "eye," mostly in plural, "the eyes," from Greek ophthalmos "eye," originally "the seeing," a word of uncertain origin. Perhaps from ōps "eye" (from PIE root *okw- "to see") + a form related to thalamos "inner room, chamber" (see thalamus), giving the whole a sense of "eye and eye socket," but Beekes rejects all this and finds it to be probably Pre-Greek.

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eyebrow (n.)

also eye-brow, early 15c., from eye (n.) + brow (q.v.; Old English eagbræw meant "eyelid").

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eyelet (n.)

"small hole," late 14c., oilet, from Old French oeillet, diminutive of oeil "eye," from Latin oculus "an eye" (from PIE root *okw- "to see"). Spelling later modified by influence of eye (n.).

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eyeful (n.)

also eye-ful, "good look at," 1796, originally in ornamental gardening, from eye (n.) + -ful.

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sansei (n.)

"American born of nisei parents; third-generation Japanese-American," 1945, from Japanese san "three, third" + sei "generation."

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has (v.)

third person singular present indicative of have.

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tercel (n.)

"male falcon," late 14c., from Old French tercel (c. 1200), from Medieval Latin tertiolus, from Latin tertius "third, a third," from root of tres "three" (see three). Various theories as to why it is called this; one says it's because the males are a third smaller than the females, another because a third egg in the nest (smaller than the other two) is believed always to produce a male bird.

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monocular (adj.)

"having only one eye; of or referring to vision with one eye," 1630s, from Late Latin monoculus "one-eyed," from Greek monos "alone, single" (from PIE root *men- (4) "small, isolated") + Latin oculus "eye" (from PIE root *okw- "to see").

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pigsney (n.)

(obsolete), late 14c., pigges-nie, an endearing form of address to a girl or woman, apparently from Middle English pigges eye, literally "pig's eye," from pig (n.1) + neyghe, a variant of eye (n.) with unetymological -n- from min eye, an eye, etc. (see N). But pig-eyed is "having small, dull eyes with heavy lids, appearing sunken." See OED for explanation of why pig's eye might have been felt as a compliment. In a pig's eye! as an adverse retort is recorded from 1872.

Hir shoes were laced on hir legges hye; She was a prymerole, a piggesnye, For any lord to leggen in his bedde. [Chaucer, "Miller's Tale"]
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