dimetrodon
/daɪˈmiːtrədɒn/noun
1- a large fossil carnivorous mammal-like reptile of the Permian period, with long spines on its back supporting a sail-like crest长棘龙。
1.1
- Genus Dimetrodon, order Pelycosauria, subclass Synapsida.异齿龙属, 盘龙目, 单弓亚纲。
词源
modern Latin, from di- 'twice' + Greek metron 'measure' + odous, odont- 'tooth' （taken in the sense 'two long teeth'）.