The Collaborative International Dictionary of English v.0.48:

Squalodon \Squa"lo*don\ (skw[=a]"l[-o]*d[o^]n), n. [NL. Squalus
   a genus of sharks + Gr. 'odoy`s, 'odo`ntos, a tooth.]
   (Paleon.)
   A genus of fossil whales belonging to the Phocodontia; -- so
   called because their teeth are serrated, like a shark's.
   [1913 Webster]