Definition of pheochromocytoma in English:

pheochromocytoma

Syllabification: phe·o·chro·mo·cy·to·ma
Pronunciation: /ˌfēōˌkrōməsīˈtōmə/

Entry from US English dictionary

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.

Origin

1920s: from pheochrome, another term for chromaffin (from Greek phaios 'dusky' + khrōma 'color'), + -cyte.

Definition of pheochromocytoma in:

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Pronunciation: nēˈätn-ē
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retention of juvenile features in the adult animal