castanets
Concise Oxford English Dictionary © 2008 Oxford University Press:
castanets/kastəˈnets/
▶plural noun 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.
– origin C17: from Sp. castañeta, dimin. of castaña, from L. castanea ‘chestnut’.
'castanets' also found in these Oxford entries:

