Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. (Zo["o]l.)
      (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 antenn[ae] of
          insects.

Tunicate \Tu"ni*cate\, n. (Zo["o]l.)
   One of the Tunicata.

Source : WordNet®

tunicate
     n : primitive marine animal having a saclike unsegmented body
         and a urochord (a notochord) conspicuous in the larva
         [syn: {urochordate}, {urochord}]