Source : Webster's Revised Unabridged Dictionary (1913)

Ringtail \Ring"tail`\, n.
   1. (Zo["o]l.) A bird having a distinct band of color across
      the tail, as the hen harrier.

   2. (Naut.) A light sail set abaft and beyong the leech of a
      boom-and-gaff sail; -- called also {ringsail}.

   {Ringtail boom} (Naut.), a spar which is rigged on a boom for
      setting a ringtail.