ichthyosaurPronunciation: /ˈɪkθɪəsɔː/ (also ichthyosaurus /ˌɪkθɪəˈsɔːrəs/)Definition of ichthyosaur noun a fossil 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 Origin: mid 19th century: from ichthyo- 'fish' + Greek sauros 'lizard'ichthyosaur in other Oxford dictionaries Definition of ichthyosaur in the US English dictionary
