Polychaeta; polychaetes
Scientific taxonomic term for a class of mostly marine annelid worms, characterized by many bristles. Used in biology and zoology contexts.
Polychaeta includes ragworms and feather duster worms.
From 多 (many) + 毛 (hair/bristle) + 綱 (class), reflecting the numerous chaetae (bristles) characteristic of this annelid class.