xeroderma pigmentosum
noun
xe·ro·der·ma pig·men·to·sum
ˌzir-ə-ˈdər-mə-ˌpig-mən-ˈtō-səm
-ˌmen-
: a genetic disorder inherited as a recessive autosomal trait that is caused by a defect in mechanisms that repair DNA mutations (such as those caused by ultraviolet light) and is characterized by the development of pigment abnormalities and multiple skin cancers in areas exposed to the sun
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Merriam-Webster unabridged
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