A phylum that includes the segmented or true worms, such as the earthworm.
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An·nel·i·da ə-'nel-ə-də, a- n pl a phylum of coelomate and usu. elongated segmented invertebrates (as earthworms, various marine worms, and leeches)
an·ne·lid 'an-əl-əd n or adj
an·nel·i·dan ə-'nel-əd-ən, a- adj or n
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An·ne·li·da (ə-nelґĭ-də) [Fr. anneler to arrange in rings, from L. anellus a little ring] a phylum of metazoan invertebrates comprising the segmented worms, and including marine annelids, freshwater annelids and earthworms, and leeches (class Hirudinea); only the latter are of medical interest.Medical dictionary. 2011.