Hartnup disease
noun
Hart·nup disease
| \ ˈhärt-ˌnəp-
\
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Medical Definition of Hartnup disease
: an inherited metabolic disease that is caused by abnormalities of the renal tubules and is characterized especially by aminoaciduria involving only monocarboxylic monoamines, a dry red scaly rash, and episodic muscular incoordination due to the effects of the disease on the cerebellum