One of the former genus Ascidium (genus) of simple ascidians, which included most of the known species; sometimes used as a name for the family Ascidiidae (family) or for all the Tunicata, or Ascidiacea.
Origin
New Latin ascidium, from Ancient Greek ἀσκίδιον, from ἀσκός + -ιδιον
Modern English dictionary
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