homogentisic acid
noun
ho·mo·gen·tis·ic acid
| \ ˌhō-mō-ˌjen-ˈtiz-ik, ˌhäm-ō-
\
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Medical Definition of homogentisic acid
: a crystalline acid C8H8O4 formed as an intermediate in the metabolism of phenylalanine and tyrosine and found especially in the urine of those affected with alkaptonuria