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The Collaborative International Dictionary of English v.0.48 (gcide)

Calamite \Cal"a*mite\, n. [L. calamus a reed: cf. F. calamite.]
(Paleon.)
A fossil plant of the coal formation, having the general form
of plants of the modern {Equiseta} (the Horsetail or Scouring
Rush family) but sometimes attaining the height of trees, and
having the stem more or less woody within. See {Acrogen}, and
{Asterophyllite}.
[1913 Webster]