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| pla·nar·i·an [ plə nérree ən ] (plural pla·nar·i·ans) |
noun |
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| Definition: |
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class of flatworm: a small flatworm that lives mainly in freshwater, is not a parasite, and has a three-branched intestine. Order Tricladida.
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| [Mid-19th century. Via modern Latin Planaria< Latin planarius "on level ground" < planus "flat" (see plain)] |
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