Rhachitomi
plural noun
Rha·chit·o·mi
rəˈkitəˌmī,
raˈk-
: an order of Labyrinthodontia including most of the larger Permian amphibians and comprising forms having rhachitomous vertebrae, relatively stocky salamandriform bodies, and in some cases external gills
Word History
Etymology
New Latin, from rachi- + -tomi (from Greek tomos cut, slice)