资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.