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Meaning of calamite

cal•a•mite

Pronunciation: (kal'u-mīt"), [key]
— n.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.