A phylum of metazoan invertebrates comprising the segmented worms, and including marine annelids (POLYCHAETA), freshwater annelids, earthworms (OLIGOCHAETA), and LEECHES. Only the leeches are of medical interest. (Dorland, 27th ed)

Synonyms: Segmented Worm, txid6340, Worms, Segmented, Worm, Segmented, Segmented Worms, Annelidas, Annelida