eyeball eyeball /ˈaɪˌbɔl/

noun

1. () The ball-shaped capsule containing the vertebrate eye  ( eyeball , orb )
   the ball-shaped capsule containing the vertebrate eye
    The doctor used a special tool to examine the orb of the patient's eye.
   The doctor used a special tool to examine the orb of the patient's eye.
   
   

verb

1. [Informal] Look at  ( eyeball [Informal] , eye )
   look at
     She couldn't help but eye the delicious cake sitting on the kitchen counter.
   She couldn't help but eye the delicious cake sitting on the kitchen counter.