Source : Webster's Revised Unabridged Dictionary (1913)

Hare's-tail \Hare's"-tail`\ (-t[=a]l`), n. (Bot.)
   A kind of grass ({Eriophorum vaginatum}). See {Cotton grass},
   under {Cotton}.

   {Hare's-tail grass} (Bot.), a species of grass ({Lagurus
      ovatus}) whose head resembles a hare's tail.