MEDICAL DICTIONARY
Chalazion : A cyst of the little glands in the eyelids that make a lubricant which they discharge through tiny openings in the edges of the lids. The lubricant is a fatty substance called sebum characteristic of sebaceous glands.
These glands are called the meibomian glands. Inflammation of them is termed meibomianitis or, alternatively, meibomitis. Chronic inflammation of the meibomian glands leads to meibomian cysts or chalazions.
The word "chalazion" is Greek for small pimple (and little hail). Like a pimple, a chalazion is an inflamed swelling. But instead of being on the skin, a chalazion is in the margin of the eyelid.
The meibomian glands are named for a 17th-century German anatomist Heinrich Meibom (who must have had good eyes to see these minute structures). They are also known as the palpebral glands, tarsal glands, or tarsoconjunctival glands.
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