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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]