What is "bridoon"

Bridoon \Bri*doon"\, n. [F. bridon, from bride; of German origin. See Bridle, n.] (Mil.) The snaffle and rein of a military bridle, which acts independently of the bit, at the pleasure of the rider. It is used in connection with a curb bit, which has its own rein.
--Campbell.

n. A type of snaffle bit, with small rings, usually used on a double bridle in conjunction with a curb bit.

n. a bit resembling a snaffle bit; used with a separate curb