vanillylmandelic acid
noun
van·il·lyl·man·de·lic acid
| \ ˌvan-ə-ˌlil-man-ˌdē-lik-
\
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Medical Definition of vanillylmandelic acid
: a principal catecholamine metabolite C9H10O5 whose presence in excess in the urine is used as a test for pheochromocytoma
—abbreviation VMA