CASTANETS
bones, castanets, clappers, finger cymbals
(noun) (used in the plural) a percussion instrument consisting of a pair of hollow pieces of wood or bone (usually held between the thumb and fingers) that are made to click together (as by Spanish dancers) in rhythm with the dance
Source: WordNet® 3.1
Noun
castanets (uncountable)
A percussion instrument (idiophone) of Spanish origin, consisting of a pair of concave shells joined on one edge by a string, held in the hand and used to produce clicking sounds; any hand-held percussion idiophone that can be played with the fingers, such as bones or spoons.
Source: Wiktionary
Cas"ta*nets, n. pl. Etym: [F. castagnettes, Sp. castañetas, fr. L.
castanea (Sp. castaña) a chestnut. So named from the resemblance to
two chestnuts, or because chestnuts were first used for castanets.
See Chestnut.]
Definition: Two small, concave shells of ivory or hard wood, shaped like
spoons, fastened to the thumb, and beaten together with the middle
finger; -- used by the Spaniards and Moors as an accompaniment to
their dance and guitars.
Note: The singular, castanet, is used of one of the pair, or,
sometimes, of the pair forming the instrument.
The dancer, holding a castanet in each hand, rattles then to the
motion of his feet. Moore (Encyc. of Music).
CASTANET
Cas"ta*net, n.
Definition: See Castanets.
Source: Webster’s Unabridged Dictionary 1913 Edition