Definition of ichthyosaur
: any of an order (Ichthyosauria) of extinct marine reptiles of the Mesozoic specialized for aquatic life by a streamlined body with a long snout, limbs reduced to small fins for steering, and a large lunate caudal fin
ichthyosaurianplay \ˌik-thē-ə-ˈsȯr-ē-ən\ adjective or noun
Origin and Etymology of ichthyosaur
ultimately from Greek ichthy- + sauros lizard
First Known Use: 1830
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