Word Study
harquebus
CIDE DICTIONARY
harquebus, n. [See Arquebus.].
A firearm with match holder, trigger, and tumbler, made in the second half of the 15th century. The barrel was about forty inches long. A form of the harquebus was subsequently called arquebus with matchlock . [1913 Webster]
OXFORD DICTIONARY
harquebus, n. (also arquebus) hist. an early type of portable gun supported on a tripod or on a forked rest.
Etymology
F (h)arquebuse ult. f. MLG hakebusse or MHG hakenb{uuml}hse, f. haken hook + busse gun
For further exploring for "harquebus" in Webster Dictionary Online