ˌ ̷ ̷ ̷ ̷ˈeˌfrēn, -_frə̇n noun
( -s )
Etymology: phenyl + epin ephrine
: a basic compound C 9 H 13 NO 2 related chemically to epinephrine and ephedrine and used in the form of the hydrochloride as a vasoconstrictor to the nasal mucosa, a mydriatic in ophthalmology, and by injection to raise the blood pressure