Sentence:  The tympanic cavity is spanned by the three smallest bones in the body: the auditory ossicles... These bones, named for their shape, are the <WSD>malleus</WSD> (malʹe-us; "hammer"); the incus (ingʹkus; "anvil"); and the stapes (staʹpēz; "stirrup"). The "handle" of the <WSD>malleus</WSD> is secured to the eardrum, and the base of the stapes fits into the oval window. 
Meaning of the word marked with <WSD> tags:  The small hammer-shaped bone of the middle ear.