聽小骨

1. • ossicles (of the middle ear)
2. • three ossicles, acting as levers to amplify sound, namely: stapes or stirrup bone 镫骨, incus or anvil bone 砧骨, malleus or hammer bone 锤骨

Character by character

• 聽(tīng)listen to
• 小(xiǎo)small
• 骨(gǔ)bone