Main Entry: horse·tail

Pronunciation: \ˈhȯrs-ˌtāl\

Function: noun

Date: 15th century

: any of a genus (Equisetum of the order Equisetales) of lower tracheophytes comprising perennial plants that spread by creeping rhizomes and have leaves reduced to nodal sheaths on the hollow jointed ribbed shoots

[horsetail illustration]