Other forms: eyeballs
An eyeball is the round body of the eye inside its socket. Roll your eyeballs, an eyeball injury, eyeball to eyeball.
It is about twenty-four millimetres across in an adult and barely grows after childhood, which is why babies' eyes look so large. Eyeball to eyeball means in direct confrontation, and to eyeball something is to look at it hard.
1nouneyeballThe round body of the eye inside its socket.
“The dust got under his contact lens and scratched the surface of his eyeball.”
eyeball is a body part.
Eye plus ball, replacing the older phrase ball of the eye.
From eye + ball. Compare Middle English balle off the eye, balle of þe eyȝe (“eyeball”) literally “ball of the eye”.
Etymology from Wiktionary, CC BY-SA