crus·ta·cean 
/krəˈsteɪʃən/ noun
plural crus·ta·ceans /krəˈsteɪʃən/ noun [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 ◊Crustaceans usually live in the water.
— crustacean adjective
