horsetail

noun7

1. •
   A tail of a horse.
2. •
   Any of various simple vascular plants, of the order Equisetales, that have hollow stems and produce spores.
3. •
   A mare's tail, a water plant in genus Hippuris.
4. •
   Any waterfall, the descending water of which maintains contact with bedrock most of the time.
5. •
   (rare) A ponytail hairstyle.

   • They were psychic mediums that wore a horsetail hairstyle. They believed that their long hair acted as cosmic antennae to receive alien communication from beyond. — 2011
6. •
   cauda equina, a bundle of nerve fibers.
7. •
   A Turkish standard denoting rank.

   • Commanders were distinguished by the number of horsetails carried before them. The sultan had seven, the grand vizier five, and the pashas three, two, or one.