tu·ni·cate /ˈtunɪkət, ˈtju, nəˌket/
  (a.)有被膜的,有被囊的
  Tu·ni·cate Tu·ni·ca·ted a.
  1. Bot. Covered with a tunic; covered or coated with layers; as, a tunicated bulb.
  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.
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  Tu·ni·cate pr. n. Zool. One of the Tunicata.
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  tunicate
       n : primitive marine animal having a saclike unsegmented body
           and a urochord (a notochord) conspicuous in the larva
           [syn: urochordate, urochord]