The Collaborative International Dictionary
Coistril
Coistril \Cois"tril\, n. [Prob. from OF. coustillier groom or lad. Cf. Custrel.]
An inferior groom or lad employed by an esquire to carry the knight's arms and other necessaries. [Written also coistrel.]
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.