parapodium
Par`a*po"di*um, n.; pl. Parapodia. Etym: [NL., fr. Gr. (Zoöl.) Defn: One of the lateral appendages of an annelid; -- called also foot tubercle. Note: They may serve for locomotion, respiration, and sensation, and often contain spines or setæ. When well developed, a dorsal part, or notopodium, and a ventral part, or neuropodium, are distinguished.