The Collaborative International Dictionary
Quirboilly
Quirboilly \Quir"boil*ly`\, n. [OE. cuir bouilli.]
Leather softened by boiling so as to take any required shape.
Upon drying, it becomes exceedingly hard, and hence was
formerly used for armor. [Obs.] ``His jambeux were of
quyrboilly.''
--Chaucer.
Wiktionary
quirboilly
n. (context obsolete Chaucer English) leather softened by boiling and shaped before it hardens, formerly used for armour.