pheochromocytoma phenytoin • pheon · · · Info · Definitions · Synonyms · Characters · · pheochromocytoma · · Text Latin · · Script 16 · · Length 7 · · Syllables Definitions · · · (noun) a vascular tumor of the adrenal gland; hypersecretion of epinephrine results in intermittent or sustained hypertension. Synonyms: phaeochromocytoma. · · Noun Definition 1 Synonyms · · · phaeochromocytoma · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079