En-ăl'i-o-saur' or En-ăl'i-o-sau'ri-an, n.

n. [Gr. ἐν, in, ἅλς, the sea, σαῦρος, σαῦρα, lizard.] (Palæon.) A marine or swimming saurian of gigantic size, now extinct, and found only in a fossil state. The family includes the ichthyosaur and allied reptiles. Dana.