Source : Webster's Revised Unabridged Dictionary (1913)

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.