crustacean /krəˈsteɪʃən/ noun plural crustaceans
plural crustaceans
Learner's definition of CRUSTACEAN
[count] technical
: a type of animal (such as a crab or lobster) that has several pairs of legs and a body made up of sections that are covered in a hard outer shell甲壳纲动物（如螃蟹、龙虾等） ◊ Crustaceans usually live in the water.甲壳纲动物通常生活在水中。