Definition of "mateine"

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, Nicolae Sfetcu, Health & Drugs: Disease, Prescription & Medication

Unlike tea and coffee, however, it does not contain caffeine. Instead, its main active ingredient is a xanthine alkaloid known as mateine.

2015, Thom Hartmann, ADHD and the Edison Gene