bridoon

[ brahy-doon, bri- ]

/ braɪˈdun, brɪ- /

a snaffle when used with a curb on a full bridle.

Origin of bridoon

1745–55; < French, Middle French bridon, equivalent to bride bridle (see bride²) + -on noun suffix

If you put the martingale on your bridoon rein you can no longer indicate approval.

Riding Recollections, 5th ed. |G. J. Whyte-Melville
When you thrust a two-pound bit and bridoon into a small pony's mouth, you hurt his feelings.

From Sea to Sea |Rudyard Kipling
With the Weymouth curb and bridoon a double bridle is, of course, used.

Riding and Driving for Women |Belle Beach
The ordinary term bit and bridoon means simply a curb and a snaffle.

Riding for Ladies |Mrs. Power O'Donoghue

The two bits together in the horse's mouth are called "the bit and bridoon," or "the curb and bridoon."

The American Horsewoman |Elizabeth Karr

bridoon

/ (brɪˈduːn) /

a horse's bit: a small snaffle used in double bridles

C18: from French bridon, from bride bridle; compare Middle English bride