cuatro
/ˈkwɑːtrəʊ/noun
(pl. cuatros)
- a small guitar, typically with four (or five) single or paired strings, used in Latin American and Caribbean folk music, especially in Puerto Rico.（演奏拉丁美洲和加勒比地区民间音乐的）四弦（或五弦）吉他。
词源
Latin American Spanish, literally 'four'.