The Collaborative International Dictionary of English v.0.48:

Rhachiodont \Rha"chi*o*dont\, a. [Gr. "ra`chis, -ios, the spine
   + ???, ???, a tooth.] (Zool.)
   Having gular teeth formed by a peculiar modification of the
   inferior spines of some of the vertebrae, as certain South
   African snakes (Dasypeltis) which swallow birds' eggs and
   use these gular teeth to crush them.
   [1913 Webster]