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c.1500, from Late Latin ocularis "of the eyes," from Latin oculus "an eye," from PIE root *okw- "to see" (cf. Gothic augo, Old English eage "eye;" see eye (n.)). As a noun, 1835, from the adjective.
ocular oc·u·lar (ŏk'yə-lər)
Of or relating to the eye or the sense of sight.
Resembling the eye in form or function.