Eyeball/ˈaɪbɔːl/ Definition 1 of 3Pro Tip 1/3Visual Organ The word 'eyeball' refers specifically to the spherical part of the eye. The optometrist examined the health of her eyeballs. Pro Tip 2/3Not the Whole Eye 'Eyeball' does not include the eyelids, eyelashes, or eyebrows; it's just the visible sphere. His eyeball was irritated, but his eyelids were fine. Pro Tip 3/3Literally Visible When speaking of 'eyeballs', it sometimes implies the colored part that is visible to others. Her green eyeballs stood out against her dark makeup.