Definition of placodont in English:

placodont

Syllabification: plac·o·dont
Pronunciation: /ˈplakəˌdänt
 
/

noun

  • An extinct marine shellfish-eating reptile of the Triassic period, having short flat grinding palatal teeth and sometimes a turtlelike shell.
    • Suborder Placodontia, superorder Sauropterygia: several families and genera, including Placodus
    More example sentences
    • 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.
    • Specifically, it seems quite possible that the choristoderes were originally shellfish-eaters like placodonts and only secondarily became long-snouted fish eaters.

Origin

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

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Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody