Main Entry: van·il·lyl·man·de·lic acid Pronunciation: "van-&-"lil-man-"dE-lik- Function: noun : a principalcatecholamine metabolite C9H10O5 whose presence in excess in the urine is used as a test for pheochromocytoma —abbreviation VMA
vanillylmandelic acid van·il·lyl·man·del·ic acid (vān'ə-lĭl'mān-děl'ĭk, və-nĭl'əl-) n. The major urinary metabolite of adrenal and sympathetic catecholamines.