n.any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
同义词：arrowworm
英汉双解大词典
chaetognath/ˈkiːtɒɡˌnæθ/
1.
N（名词）
any small wormlike marine invertebrate of the phylum Chaetognatha, including the arrowworms, having a coelom and a ring of bristles around the mouth 毛颚类动物