n. A genus of carangoid fishes found in warm seas.n. In zoology and anatomy, a bone of the skull of most vertebrates; a membrane-bone or splint-bone developed in the median line of the skull, beneath the basicranial axis, primitively consisting of paired halves, which sometimes remain separate, one on each side of the middle line.n. In ornithology, the pygostyle or rump-post; the large, peculiarly shaped terminal bone of the tail of most birds, consisting of several ankylosed vertebræ. See cut under pygostyle.