You searched for: “idiophonic
idiophone, idiophonic
1. A musical instrument (as a bell, gong, rattle) the source of whose sound is the vibration of its elastic constituent material unmodified by any special tension (as in a drum); also known as an autophone.
2. A percussion instrument, e.g. a gong or xylophone, that is made from resonating material that does not have to be tuned.