cuatro
/ˈkwatɾo/ · A1 · num
four
4️⃣🎸 cuatro = quart-: a quart is a fourth of a gallon, a quarter is one of four
From Latin quattuor, the same root behind English quart, quarter and quartet. The qu- became cu- in Spanish but the kw sound stayed. The cuatro guitar is named for its four strings.