polychete worm po·lyc·he·teworm uncommon noun 1. chiefly marine annelids possessing both sexes and having paired appendages (parapodia) bearing bristles Synonymspolychaetepolychetepolychaete wormpolychete worm Related words Broader terms annelid Narrower terms lugwormsea mousebloodworm Parts Polychaeta WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.