appendicularian UK /ˌæpənˌdɪkjʊˈlɛəɹi.ən/US /ˌæpənˌdɪkjəˈlɛɹi.ən/adjective 1noun 1forms 1 adjective1 •Pertaining to the class Appendicularia of tailed tunicates. noun1 •A member of this class. formsappendicularians