Cois″tril (?), 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.]
2. A mean, paltry fellow; a coward. Shak.
Webster's Dictionary 1913
Cois″tril (?), 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.]
2. A mean, paltry fellow; a coward. Shak.