A catabolite of epinephrine found, together with normetanephrine, in the urine and in some tissues, resulting from the action of catechol-O-methyltransferase on epinephrine; has no sympathomimetic actions.
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meta·neph·rine -'nef-.rēn n a catabolite of epinephrine that is found in the urine and some tissues
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meta·neph·rine (met″ə-nefґrin) a methylated metabolite of epinephrine excreted in the urine and found in certain tissues.Medical dictionary. 2011.