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| o·pis·tho·branch [ ə písthə bràngk ] (plural o·pis·tho·branchs) |
noun |
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| Definition: |
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mollusk with gills: an invertebrate ocean animal that has gills, a small or nonexistent shell, and tentacles
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| [Mid-19th century. < modern Latin Opisthobranchiata< Greek opisthen "behind" + bragkhia "gills," because the gills are behind the heart] |
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