mateine /ˈmæteɪˌiːn/ noun2 •Caffeine extracted from maté plant.Caffeine is a xanthine alkaloid compound that acts as a stimulant in humans. Caffeine is sometimes called guaranine when found in guarana, mateine when found in mate, and theine when found in tea. — 2014 •A hypothetical xanthine alkaloid said to be found in maté, supposed to resemble caffeine.Unlike tea and coffee, however, it does not contain caffeine. Instead, its main active ingredient is a xanthine alkaloid known as mateine. — 2015
