autocannon
autocannon is a cannon or externally powered gun.
Also recorded as automatic cannon.
Overview
Rapid-fire projectile weapon that fires armour-piercing or explosive shells.
In detail
autocannon is a cannon or externally powered gun.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Autocannon”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q751705: autocannon
Consult the source