The round part of your eye that sits in your eye socket and lets you see the world.
Compound of 'eye' (Old English 'eage') and 'ball' (describing its round shape). This word emerged in the 1500s as people needed a specific term for the spherical organ itself.
Your eyeball is constantly moving in tiny, invisible jerks called saccades—without them, you'd literally go blind because your brain needs motion to process visual information. It's why things disappear if you stare without blinking!
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