plural pheos
medical
: pheochromocytoma
There are rare tumors—pheochromocytoma—that secrete high levels of adrenaline, and such tumors can cause this combination of high blood pressure and orthostatic hypotension. … But if the patient did have a "pheo" (as it's called), that could explain why her symptoms became so much worse after her heart attack.—Lisa Sanders
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Merriam-Webster unabridged
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