单词 | placula |
释义 | placula/ˈplakjʊlə/Zoology noun A disc-shaped embryo, occurring as a developmental stage in urochordates and some sponges; a hypothetical primitive metazoan resembling this. OriginLate 19th century. From German Plakula from ancient Greek πλάκ-, πλάξ tablet, plate + German -ula. |
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