alkaptonuria

noun

al·​kap·​ton·​uria

variants or alcaptonuria

(ˌ)al-ˌkap-tə-ˈn(y)u̇rē-ə 

: a rare recessive metabolic anomaly in humans marked by inability to complete the degradation of tyrosine and phenylalanine resulting in the presence of alkapton in the urine