ramshorn

noun
rams·​horn | \ˈramz-ˌhȯrn \

Definition of ramshorn 

: any of various snails (such as genera Planorbis, Helisoma, and Planorbarius) often used as aquarium scavengers

First Known Use of ramshorn

1778, in the meaning defined above

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The first known use of ramshorn was in 1778

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