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  1. Oxford Dictionary

    opisthobranch

    • IPA[ə(ʊ)ˈpɪsθəˌbraŋk]

    英式

    • n.
      a marine mollusc of a group that includes the sea slugs and sea hares. They have a small or absent shell and are typically brightly coloured with conspicuous external gills.

    • noun: opisthobranch, plural noun: opisthobranchs