any fossil plant of the genus Calamites and related genera of the Carboniferous Period, resembling oversized horsetails and constituting much of the coal used as fuel.

1745–55; < Neo-Latin Calamites the genus name, Latin calamītēs < Greek kalamī́tēs reedlike. See calamus, -ite1

calamitean [kal-uh-mahy-tee-uhn] , adjective
calamitoid [kuh-lam-i-toid] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calamite (ˈkæləˌmaɪt)
any extinct treelike plant of the genus Calamites, of Carboniferous times, related to the horsetails
[C19: from New Latin Calamītes type genus, from Greek kalamitēs reedlike, from kalamos reed]

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