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The Collaborative International Dictionary
Coistril

Coistril \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. [Obs.]
    --Shak.

Wiktionary
coistril

n. 1 (context obsolete English) An inferior groom or lad employed by an esquire to carry the knight's arms and other necessaries; a coistrel. 2 (context obsolete English) A mean, paltry fellow; a coward.