The Collaborative International Dictionary of English v.0.48:

Tunicate \Tu"ni*cate\, Tunicated \Tu"ni*ca`ted\, a. [L.
   tunicatus, p. p. of tunicare to clothe with a tunic, fr.
   tunica a tunic.]
   1. (Bot.) Covered with a tunic; covered or coated with
      layers; as, a tunicated bulb.
      [1913 Webster]

   2. (Zool.)
      (a) Having a tunic, or mantle; of or pertaining to the
          Tunicata.
      (b) Having each joint buried in the preceding
          funnel-shaped one, as in certain antennae of insects.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tunicate \Tu"ni*cate\, pr. n. (Zool.)
   One of the Tunicata.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tunicate
    n 1: primitive marine animal having a saclike unsegmented body
         and a urochord that is conspicuous in the larva [syn:
         tunicate, urochordate, urochord]