Pronunciation: (hôrs'tāl"), [key]
1. Also called scouring rush. any nonflowering plant of the genus Equisetum, having hollow, jointed stems.
2. a horse's tail formerly used as a Turkish military standard or as an ensign of a pasha, the number of tails increasing with the rank.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.