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The Collaborative International Dictionary
Thorntail

Thorntail \Thorn"tail`\, n. (Zo["o]l.) A beautiful South American humming bird ( Gouldia Popelairii), having the six outer tail feathers long, slender, and pointed. The head is ornamented with a long, pointed crest.

Wiktionary
thorntail

n. Any of various hummingbirds of the genus ''Discosura''.