Sentence:  Miss Pulova has a voice that Maria Callas once described as `` like chipping <WSD>teeth</WSD> with a screw driver '' , and her round , opalescent face becomes fascinatingly reflective of the emotions demanded by the role of Rosalie . 
Meaning of the word marked with <WSD> tags:  hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense