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 malleus (malʹe-us; "hammer"); the <WSD>incus</WSD> (ingʹkus; "anvil"); and the stapes (staʹpēz; "stirrup"). 
Meaning of the word marked with <WSD> tags:  A small anvil-shaped bone in the middle ear.