The Collaborative International Dictionary of English v.0.48:

Carronade \Car`ron*ade\, n. [From Carron, in Scotland where it
   was first made.] (Med.)
   A kind of short cannon, formerly in use, designed to throw a
   large projectile with small velocity, used for the purpose of
   breaking or smashing in, rather than piercing, the object
   aimed at, as the side of a ship. It has no trunnions, but is
   supported on its carriage by a bolt passing through a loop on
   its under side.
   [1913 Webster]