Source : Webster's Revised Unabridged Dictionary (1913)

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}.