noun
bristle worm; polychaete
Scientific term for marine annelid worms of the class Polychaeta, characterized by many bristles (chaetae) on each body segment.
多毛類は海底の砂泥中に多く生息している。
Polychaetes live in large numbers in the sand and mud of the seafloor.
From 多 (many) + 毛 (hair/bristle) + 類 (group/class), referring to the numerous bristles characteristic of polychaete worms.