ichthyosaur
noun
ich·thyo·saur
ˈik-thē-ə-ˌsȯr
: 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
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Merriam-Webster unabridged
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