Source : Webster's Revised Unabridged Dictionary (1913)

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