Definition of flagtail in US English:

flagtail

noun

  • 1A tail that is conspicuous or carried high, especially that of a horse or (now more commonly) a deer.

  • 2A deer with a flagtail; especially the white-tailed deer, Odocoileus virginianus.

  • 3Any of several small fishes of the Indo-Pacific genus Kuhlia (family Kuhliidae), with silvery compressed bodies.

Origin

Mid 19th century; earliest use found in Journal Agriculture. From flag + tail.

Pronunciation

flagtail

/ˈflaɡteɪl/