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From The Collaborative International Dictionary of English v.0.48:
Zeuglodon \Zeu"glo*don\, n. [Gr. ? the strap or loop of a yoke + ?, ?, tooth.] (Paleon.) A genus of extinct Eocene whales, remains of which have been found in the Gulf States. The species had very long and slender bodies and broad serrated teeth. See Phocodontia. [1913 Webster]