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.

Source: Webster's Revised Unabridged Dictionary (1913)