Source: The Collaborative International Dictionary of English v.0.48
percussion instrument \per*cus"sion in"stru*ment\
(p[~e]r*k[u^]sh"[u^]n [i^]n"str[u^]*m[e^]nt), n.
A musical instrument which is played by striking, as a drum,
cymbal, or xylophone.
[PJC]