What does arquebus or arquebuse mean?
The definition of arquebus and arquebuse
Ar”que*bus, Ar”que*buse, n.
Etym: [F. arquebuse, OF. harquebuse, fr. D. haak-bus; cf. G. hakenbüchse a gun with a hook. See Hagbut.]

A sort of hand gun or firearm a contrivance answering to a trigger, by which the burning match was applied. The musket was a later invention. [Written also harquebus.]