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]