1. A small, painless swelling or cyst on the eyelid caused by a blocked oil gland.
Usage: Medical term; also spelled 'chalazium' (less common).; Plural: chalazia or chalazions.

Examples

• She developed a chalazion on her upper eyelid after several weeks of eye irritation.
• The doctor explained that a chalazion is different from a stye because it is usually painless.
• Most chalazions disappear on their own within a few months.
• Warm compresses can help drain a chalazion naturally.
• If the chalazion does not go away, an eye specialist may need to remove it surgically.
• He noticed a small bump on his eyelid and was diagnosed with a chalazion at his eye exam.