The Collaborative International Dictionary of English v.0.48:

Fossores \Fos*so"res\, n. pl. [NL., fr. L. fossor? digger, fr.
   fodere to dig.] (Zool.)
   A group of hymenopterous insects including the sand wasps.
   They excavate cells in earth, where they deposit their eggs,
   with the bodies of other insects for the food of the young
   when hatched. [Written also Fossoria.]
   [1913 Webster]