Definition of horsetail
: any of a genus (Equisetum of the order Equisetales) of lower tracheophytes comprising perennial, spore-producing plants that spread by creeping rhizomes and have leaves reduced to nodal sheaths on the hollow jointed ribbed shoots
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Merriam-Webster unabridged
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Time Traveler for horsetail
The first known use of horsetail was in the 15th century
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