castanetsyoudaoicibaDictYouDict[castanets 词源字典]
"Small concave pieces of wood, ivory, or plastic, joined in pairs by a cord and clicked together by the fingers as a rhythmic accompaniment to Spanish dancing", Early 17th century: from Spanish castañeta, diminutive of castaña, from Latin castanea 'chestnut'.[castanets etymology, castanets origin, 英语词源]