👉 The term "polychaetan" is used in the context of biology to describe a type of organism that has two sets of wings, one set on each side of its body. These wings are usually paired and can be arranged in a variety of ways, with some organisms having multiple sets of wings such as fish or birds. Polychaetes are a group of marine animals that include polychaete worms, which are also known as polychaectes.