%coistril%

n. [ Prob. from OF. coustillier groom or lad. Cf. Custrel. ] 1. An inferior groom or lad employed by an esquire to carry the knight's arms and other necessaries. [ Written also coistrel. ] [ 1913 Webster ]

2. A mean, paltry fellow; a coward. [ Obs. ] Shak. [ 1913 Webster ]