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monilethrix

n. A rare autosomal-dominant hair disease that results in short, fragile, broken hair with a beaded appearance.

Wikipedia
Monilethrix

Monilethrix (also referred to as beaded hair) is a rare autosomal dominant hair disease that results in short, fragile, broken hair that appears beaded. It comes from the Latin word for necklace (monile) and the Greek word for hair (thrix).