calamite

noun
cal·a·mite | \ˈka-lə-ˌmīt \

Definition of calamite 

: a Paleozoic fossil plant (especially genus Calamites) resembling a giant horsetail

First Known Use of calamite

1825, in the meaning defined above

History and Etymology for calamite

New Latin Calamites, genus of fossil plants, from Latin calamus

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The first known use of calamite was in 1825

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