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.

updated on April 27, 2020

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Definitions of eyeball from WordNet
1
eyeball (v.)
look at;
Synonyms: eye
2
eyeball (n.)
the ball-shaped capsule containing the vertebrate eye;
Synonyms: orb
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.