Definitions of ascidian
  1. noun
    minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves
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    sea squirt
    ascidian that can contract its body and eject streams of water
    type of:
    tunicate, urochord, urochordate
    primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva
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