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Definition of Thorntail
1. n. 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.
Definition of Thorntail
1. Noun. (zoology) Any of various hummingbirds of the genus ''Discosura''. ¹
¹ Source: wiktionary.com
Medical Definition of Thorntail
1.