bonelet, ossicle, ossiculum - a small bone; especially one in the middle ear

auditory apparatus - all of the components of the organ of hearing including the outer and middle and inner ears

bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body

auditory tube, Eustachian tube - either of the paired tubes connecting the middle ears to the nasopharynx; equalizes air pressure on the two sides of the eardrum

malleus, hammer - the ossicle attached to the eardrum

incus, anvil - the ossicle between the malleus and the stapes

stapes, stirrup - the stirrup-shaped ossicle that transmits sound from the incus to the cochlea