anarthropoda

from The Century Dictionary.

• In zoology, in some systems of classification, one of two prime divisions (Arthropoda being the other) of the Annulosa or ringed animals, namely, those which have no articulated appendages or jointed limbs, such as the Annelida and the Gephyrea.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) One of the divisions of Articulata in which there are no jointed legs, as the annelids; -- opposed to Arthropoda.