The Collaborative International Dictionary of English v.0.48:

Anarthropoda \An`ar*throp"o*da\, n. pl. [NL., from Gr. ? without
   joints + -poda. See Anarthrous.] (Zool.)
   One of the divisions of Articulata in which there are no
   jointed legs, as the annelids; -- opposed to Arthropoda.
   [1913 Webster]