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