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pla·nar·i·an AHD[plə-nârʹē-ən] D.J.[pləˈneəriːən]K.K.[pləˈnɛriən]n.（名词）- Any of various small, chiefly freshwater turbellarian flatworms of the order Tricladida, having soft, broad, ciliated bodies, a three-branched digestive cavity, and the ability to regenerate body parts.涡虫：三肠目的主要生于淡水的小涡虫类扁形虫，具有柔软、宽阔、长纤毛和助消化的三叉腔以及再生身体其它部分的能力
- From New Latin Plānāria [genus name] 源自 新拉丁语 Plānāria [属名]
- from feminine of Late Latin plānārius [on level ground] 源自 后期拉丁语 plānārius的阴性词 [地平线]
- from plānus [flat] * see pelə- 2源自 plānus [平的] * 参见 pelə- 2
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