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    ram's horn
  1. ramshorn snail

    • IPA[ˌramzˌhôrn ˈsnāl]

    美式

    • n.
      a plant-eating European freshwater snail that has a flat spiral shell.
    • noun: ramshorn snail, plural noun: ramshorn snails

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    • IPA[ˈramzhɔːn]

    英式

    • n.
      a European freshwater snail which has a flat spiral shell.

    Oxford Dictionary