Webster's English Dictionary

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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