'Horsetail' definitions:

Definition of 'horsetail'

(from WordNet)
noun
Perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America

Definition of 'Horsetail'

From: GCIDE
  • Horsetail \Horse"tail`\, n.
  • 1. (Bot.) A leafless plant, with hollow and rushlike stems. It is of the genus Equisetum, and is allied to the ferns. See Illust. of Equisetum. [1913 Webster]
  • 2. A Turkish standard, denoting rank. [1913 Webster]
  • Note: Commanders are distinguished by the number of horsetails carried before them. Thus, the sultan has seven, the grand vizier five, and the pashas three, two, or one. [1913 Webster]
  • Shrubby horsetail. (Bot.) See Joint-fir. [1913 Webster]