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pheochromocytoma

Syllabification: (phe·o·chro·mo·cy·to·ma)

Pronunciation: /ˌfēōˌkrōməsīˈtōmə/

Definition of pheochromocytoma

noun (plural pheochromocytomas or pheochromocytomata /-ˈtōmətə/)

Medicine

a small vascular tumor of the adrenal medulla, causing irregular secretion of epinephrine and norepinephrine, leading to attacks of raised blood pressure, palpitations, and headache.