cuaderno
/kwaˈdeɾno/ · B2 · noun · m
notebook
📓 cuaderno = cuatro (four) + derno: old notebooks were folded into four-leaf sets
Cuaderno comes from Latin quaternum, meaning a set of four, because sheets were folded into groups of four leaves. Spot the cua- start like cuatro (four) to link the word to a bound set of pages.