monilethrix

noun
mo·nil·e·thrix | \ mə-ˈnil-ə-ˌthriks \
plural moniletriches\ˌmän-ə-ˈle-trə-ˌkēz \

Medical Definition of monilethrix 

: an inherited disease of the hair in which each strand of hair has a beaded appearance due to periodic narrowing of the hair shaft and that is marked chiefly by fragile, brittle hair and patchy alopecia

Note: Monilethrix is typically inherited as an autosomal dominant trait requiring only one parent pass on a copy of the defective gene on a chromosome other than a sex chromosome.

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