/ Dictionary / Index P phenoxybenzamine: Meaning and Definition of Find definitions for: phe•nox•y•ben•za•mine Pronunciation: (fi-nok"sē-ben'zu-mēn"), [key] — n. Pharm. an alpha blocker, CHClNO, used to dilate vascular peripheral blood vessels in the treatment of Raynaud's disease and in pheochromocytoma. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phenoxide phentolamine Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language