bangtail

noun

bang·​tail ˈbaŋ-ˌtāl 

1

US, dated slang : racehorse

That thoroughbred will leave the other bangtails standing still.

—The American Girl

2

: a detachable slip attached to the flap or back panel of an envelope

A bangtail is the perforated coupon attached to the body of a return envelope, which must be torn off before the envelope is sealed.

—The Times-Union (Albany, New York)

Word History

Etymology

bangtail short tail

First Known Use

1887, in the meaning defined at sense 1