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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
— ich·thyo·sau·ri·an\ˌik-thē-ə-ˈsȯr-ē-ən\adjective or noun