Entry 1 sense Webster, 1913 Crustacean /(kr?s-t?"shan; 97)/ · Crus·ta·cean · IPA /kɹʌsˈteɪʃən/ 01 a. Of or pertaining to the Crustacea; crustaceous. 1. Of or pertaining to the Crustacea; crustaceous.(Zool.)