tunicate
1. tu.ni.cate also tu.ni.cat.ed \'t(y)u:-ni-k*t, -n*-.ka-t\ \-n*-.ka-t-*d\ aj 1a: having or covered with a tunic or tunica 1b: having, arranged in, or made up of concentric layers {a ~ bulb } 2: of or relating to the tunicates 2. tunicate n [deriv. of L tunica membrane] : any of a subphylum (Tunicata) of lowly marine chordates with a reduced n ervous system and an outer cuticular covering