Correct spelling for the English word "perezon" is [pˈɛɹɛzən], [pˈɛɹɛzən], [p_ˈɛ_ɹ_ɛ_z_ə_n] (IPA phonetic alphabet).
A yellow principle, pipitzahoic acid, vegetable gold, C15H13O3, derived from the roots of several species of Perezia; a drastic cathartic in doses of gr. 4-8 (0.25-0.5).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.