tercio
/ˈteɾθjo/ · B2 · adj
third, one of three equal parts
🍺 tercio = ter- (three, as in tertiary) + -cio: one of three parts
Spanish tercio comes from Latin tertius, 'third', the same root as English tertiary and tercet. A tercio of beer is a small 0.33 L bottle, roughly a third of a liter.