Definition of ichthyosaur in English:


Syllabification: ich·thy·o·saur
Pronunciation: /ˈikTHēəˌsôr
(also ichthyosaurus /ˌikTHēəˈsôrəs/)


  • An extinct marine reptile of the Mesozoic era resembling a dolphin, with a long pointed head, four flippers, and a vertical tail.
    • Order Ichthyosauria, subclass Diapsida: numerous genera, including Ichthyosaurus
    More example sentences
    • They included the great marine reptiles such as ichthyosaurs and plesiosaurs, but also smaller creatures such as ammonites and belemnites - the precursor's of today's squid.
    • Vertebrate remains include isolated skeletal elements and tooth plates of palaeonisciform and actinopterygian fish, as well as body fossils of ichthyosaurs and other marine reptiles.
    • More distantly related to true dinosaurs were the marine plesiosaurs and ichthyosaurs.



Pronunciation: /ˌikTHēəˈsôrēən/
More example sentences
  • The notion that some ichthyosaurian behavior - such as spawning, stranding, or coastal foraging - brought these Shonisaurus together is improbable.
  • The largest ichthyosaurian eye that I've measured was 264 mm across, and belonged to a Temnodontosaurus platyodon.
  • So here are some estimates of ichthyosaurian weight that I have calculated using a computer program called PaleoMass.


mid 19th century: from ichthyo- 'fish' + Greek sauros 'lizard'.

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elaborate ornamentation of a vocal melody