placodont
/ˈplækəʊdɒnt/noun
1- a fossil marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtle-like shell盾齿龙。
1.1
- Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus.盾齿龙亚目, 鳍龙总目：数科, 数属, 包括盾齿龙属。
词源
late 19th cent.: from Greek plax, plak- 'flat plate' + odous, odont- 'tooth'.