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