Rhachitomi
plural noun
Rha·chit·o·mi
| \ rəˈkitəˌmī, raˈk-\
Definition of Rhachitomi
: 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
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