| NOUN | animal | ascidian | minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves |
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| Meaning | minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves. | |
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| Member of | Ascidiaceae, class Ascidiaceae | sometimes classified as an order |
| Narrower | sea squirt | ascidian that can contract its body and eject streams of water |
| Broader | tunicate, urochordate, urochord | Primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva |
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