any annelid of the class Polychaeta, having unsegmented swimming appendages with many setae or bristles.
Also, polychaetous. belonging or pertaining to the Polychaeta.

1885–90; < Neo-Latin Polychaeta < Greek polychaítēs having much hair. See poly-, chaeta

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World English Dictionary
polychaete (ˈpɒlɪˌkiːt)
1.  any marine annelid worm of the class Polychaeta, having a distinct head and paired fleshy appendages (parapodia) that bear bristles (chaetae or setae) and are used in swimming: includes the lugworms, ragworms, and sea mice
2.  of, relating to, or belonging to the class Polychaeta
[C19: from New Latin, from Greek polukhaitēs: having much hair; see chaeta]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
polychaete or polychete   (pŏl'ĭ-kēt')  Pronunciation Key 
Any of various often brightly colored annelid worms of the class Polychaeta. Each segment of a polychaete has a pair of fleshy appendages that are tipped with bristles (setae), used for swimming or burrowing. Most species of polychaetes live in saltwater, feed on tiny aquatic animals and plants, and range in size from a few millimeters to 3 m (10 ft) in length. Compare oligochaete.
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