harquebus

also ar·que·bus (är'-)
n.
A heavy portable matchlock gun invented during the 15th century. Also called hackbut.

[Obsolete French harquebuse, from Old French, alteration of Middle Dutch hakebus : hake, hook + busse, gun (from Late Latin buxis, box; see box¹).]

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The noun has one meaning:

Meaning #1: an obsolete firearm with a long barrel
  Synonyms: arquebus, hackbut, hagbut

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