Definition of placodont in English:

placodont

noun ˈplakə(ʊ)dɒntˈplakəˌdänt

A marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtle-like shell.
Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus
Example sentencesExamples
- The placodont palate bears a rather striking resemblance to the turtle palate except that both the palatines and the maxillae bear huge crushing teeth.
- Specifically, it seems quite possible that the choristoderes were originally shellfish-eaters like placodonts and only secondarily became long-snouted fish eaters.
- This change is so dramatic that with the exception of a single genus of placodont, all Rhaetian marine reptiles are of the classic ‘Liassic’ (early Jurassic) type.
- Ichthyosaurs and sauropterygians (plesiosaurs, placodonts, and nothosaurs) were marine reptiles restricted to the Mesozoic.
- It had been suggested some time ago that turtles are closely related to the turtle-like placodonts.

Origin

Late 19th century: from Greek plax, plak- 'flat plate' + odous, odont- 'tooth'.

Definition of placodont in US English:

placodont

nounˈplakəˌdänt

A marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtle-like shell.
Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus
Example sentencesExamples
- It had been suggested some time ago that turtles are closely related to the turtle-like placodonts.
- The placodont palate bears a rather striking resemblance to the turtle palate except that both the palatines and the maxillae bear huge crushing teeth.
- Specifically, it seems quite possible that the choristoderes were originally shellfish-eaters like placodonts and only secondarily became long-snouted fish eaters.
- Ichthyosaurs and sauropterygians (plesiosaurs, placodonts, and nothosaurs) were marine reptiles restricted to the Mesozoic.
- This change is so dramatic that with the exception of a single genus of placodont, all Rhaetian marine reptiles are of the classic ‘Liassic’ (early Jurassic) type.

Origin

Late 19th century: from Greek plax, plak- ‘flat plate’ + odous, odont- ‘tooth’.

单词	placodont
释义	Definition of placodont in English: placodont noun ˈplakə(ʊ)dɒntˈplakəˌdänt A marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtle-like shell. Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus Example sentencesExamples The placodont palate bears a rather striking resemblance to the turtle palate except that both the palatines and the maxillae bear huge crushing teeth. Specifically, it seems quite possible that the choristoderes were originally shellfish-eaters like placodonts and only secondarily became long-snouted fish eaters. This change is so dramatic that with the exception of a single genus of placodont, all Rhaetian marine reptiles are of the classic ‘Liassic’ (early Jurassic) type. Ichthyosaurs and sauropterygians (plesiosaurs, placodonts, and nothosaurs) were marine reptiles restricted to the Mesozoic. It had been suggested some time ago that turtles are closely related to the turtle-like placodonts. Origin Late 19th century: from Greek plax, plak- 'flat plate' + odous, odont- 'tooth'. Definition of placodont in US English: placodont nounˈplakəˌdänt A marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtle-like shell. Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus Example sentencesExamples It had been suggested some time ago that turtles are closely related to the turtle-like placodonts. The placodont palate bears a rather striking resemblance to the turtle palate except that both the palatines and the maxillae bear huge crushing teeth. Specifically, it seems quite possible that the choristoderes were originally shellfish-eaters like placodonts and only secondarily became long-snouted fish eaters. Ichthyosaurs and sauropterygians (plesiosaurs, placodonts, and nothosaurs) were marine reptiles restricted to the Mesozoic. This change is so dramatic that with the exception of a single genus of placodont, all Rhaetian marine reptiles are of the classic ‘Liassic’ (early Jurassic) type. Origin Late 19th century: from Greek plax, plak- ‘flat plate’ + odous, odont- ‘tooth’.
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