n. & adj.
n. any marine animal of the subphylum Urochordata having a rubbery or hard outer coat, including sea squirts.
adj. 1 Zool. of or relating to this subphylum. 2 a Zool. enclosed in a tunic. b Bot. having concentric layers.
[ L tunicatus past part. of tunicare clothe with a tunic (as TUNICA) ]