knightEnglishOxford American Thesaurusknight noun knights in armor: chevalier, cavalier, cavalryman, horseman, equestrian; gallant, champion, paladin, banneret, knight errant; lord, noble, nobleman.□ knight in shining armorshe's still waiting for her knight in shining armor: Sir Galahad, knight on a white charger, protector, rescuer, savior, preserver, champion, defender, guardian, guardian angel, deliverer, liberator; hero.