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equisetum

e·qui·se·tum [ kwə stəm, èkwə stəm ] (plural e·qui·se·tums or e·qui·se·ta [ kwə stə ])


noun 
Definition:
 
nonflowering plant: a nonflowering plant with a hollow jointed stem, tiny thin leaves, and spore-producing cones borne at the top of the stems. Genus Equisetum.

[Late 17th century. < Latin equisaetum "horse bristle"]
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