What does annelida mean?
The definition of annelida
An*nel”i*da, n. pl.
Etym: [NL. See Annelid.] (Zoöl.)

A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See Chætopoda.