(1):

(n.) A cetacean, or a sirenian.

(2):

(v. t.) To cut off or remove a limb or essential part of; to maim; to cripple; to hack; as, to mutilate the body, a statue, etc.

(3):

(v. t.) To destroy or remove a material part of, so as to render imperfect; as, to mutilate the orations of Cicero.

(4):

(a.) Having finlike appendages or flukes instead of legs, as a cetacean.

(5):

(a.) Deprived of, or having lost, an important part; mutilated.