arquebus
Multiple Entries:arquebus harquebus
Concise Oxford English Dictionary © 2008 Oxford University Press:
arquebus /ˈɑːkwɪbəs/
▶noun variant spelling of harquebus.
Concise Oxford English Dictionary © 2008 Oxford University Press:
harquebus /ˈhɑːkwɪbəs/ (also arquebus)
▶noun historical an early type of portable gun supported on a tripod or a forked rest.
– origin C16: from Fr. harquebuse, based on Mid. Low Ger. hakebusse, from hake ‘hook’ + busse ‘gun’.
'arquebus' also found in these Oxford entries:

