11 letters · 22 points in Scrabble
noun any of several marine reptiles of the Mesozoic having a body like a porpoise with dorsal and tail fins and paddle-shaped limbs
originBorrowed from translingual Ichthyosaurus, equivalent to Ancient Greek ἰχθύς (ikhthús, “fish”) + Ancient Greek σαῦρος (saûros, “lizard”).
Etymology from Wiktionary, CC BY-SA 3.0