pseudoephedrine UK /sjuː.dəʊˈɛf.ə.dɹiːn/US /su.doʊ.ɪˈfɛ.dɹɪn/ noun1 •A sympathomimetic alkaloid commonly used as a decongestant; a chemical compound, an isomer of ephedrine, with the formula C₁₀H₁₅NO. formspseudoephedrines
