horsetail

• horse tail

From Middle English horsetaile, horstaile, equivalent to horse +‎ tail.

• IPA^(key): /ˈhɔː(ɹ)s.teɪl/

horsetail (plural horsetails)

1. (literal) The tail of a horse. (Can we add an example for this sense?)
2. (botany) Any of various simple vascular plants, of the order Equisetales, that have hollow stems and produce spores.
3. (military) 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.

4. (botany) A mare's tail, a water plant in genus Hippuris.
5. Any waterfall, the descending water of which maintains contact with bedrock most of the time.
6. (anatomy) cauda equina, a bundle of nerve fibers.
7. (rare) A ponytail hairstyle.
   • 2011, George Romero, The Rescue, page 160:

     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.

   • 2012, Clayton Emery, Mortal Consequences: Forgotten Realms:

     The woman was tall and rail-thin, bony across the shoulders and breast, with arms and legs of wire and gristle. A fighter, she wore the traditional haircut, shaved temples, roach of hair tugged back in a horsetail.

• Equisetum
• Equisetum subg. Hippochaete (syn. Hippochaete)
• scouring rush
• snake-grass

• horse tail on Wikipedia.Wikipedia
• Equisetum on Wikipedia.Wikipedia
• Equisetum on Wikispecies.Wikispecies
• Equisetum on Wikimedia Commons.Wikimedia Commons

• aeroliths, isotheral