輕勒,小轡
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.
bridoon n : a bit resembling a snaffle bit; used with a separate curb