TUNICATE

I. adjective also ~d Etymology: Latin tunicatus, from tunica Date: circa 1623 1. having or covered with a tunic or tunica, having, arranged in, or made up of concentric layers , of or relating to the ~s, II. noun Etymology: New Latin Tunicata, from neuter plural of Latin tunicatus Date: 1889 any of a subphylum (Urochordata syn. Tunicata) of marine chordate animals (as ascidians) that are filter feeders having a thick secreted covering layer, a greatly reduced nervous system, and only in the larval stage a notochord