A plant in the taxonomic genus Equisetum (horsetails) (Equisetum fluviatile, syn. Equisetum limosum).

A plant in the taxonomic genus Equisetum (horsetails); Equisetum hyemale.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum variegatum.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum scirpoides.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum pratense.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum sylvaticum.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum telmateia.

A plant in the taxonomic genus Equisetum (horsetails); Equisetum arvense.

plural of horseback

(Canada, informal) The U-shaped area of the Canadian province of Ontario which extends along the northwestern, western, and southwestern shoreline of Lake Ontario from metropolitan Toronto to the Niagara River, comprising one of Canada's most populated and economically productive regions.