mutilate
1. Deprived of, or having lost, an important part; mutilated.
2. <zoology> Having finlike appendages or flukes instead of legs, as a cetacean.
Origin: L. Mutilatus, p.p. Of mutilare to mutilate, fr. Mutilus maimed; cf. Gr, . Cf. Mutton.
<zoology> A cetacean, or a sirenian.
Source: Websters Dictionary