Calamite n. : 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.

Example:
what are the Calamite relatives and where can we see them?

Taxonomy
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Defination from the web:
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