Plural of chalazion, which is a small bump on the eyelid caused by a blocked oil gland.
From Greek 'χαλάζιον' (chalazion), related to 'chalaza' (hailstone). The bumps were named for their resemblance to small hard granules.
A chalazion might remind you of a tiny hailstone on your eyelid, which is exactly why ancient Greek doctors named it that—the visual metaphor stuck for over 2,000 years.
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