The Collaborative International Dictionary of English v.0.48:

Cannonade \Can`non*ade"\, n. [F. Canonnade; cf. It. cannanata.]
   1. The act of discharging cannon and throwing ball, shell,
      etc., for the purpose of destroying an army, or battering
      a town, ship, or fort; -- usually, an attack of some
      continuance.
      [1913 Webster]

            A furious cannonade was kept up from the whole
            circle of batteries on the devoted towm. --Prescott.
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   2. Fig.; A loud noise like a cannonade; a booming.
      [1913 Webster]

            Blue Walden rolls its cannonade.      --Ewerson.
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The Collaborative International Dictionary of English v.0.48:

Cannonade \Can`non*ade"\, v. t. [imp. & p. p. Cannonade; p.
   pr. & vb. n. Cannonading.]
   To attack with heavy artillery; to batter with cannon shot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Cannonade \Can`non*ade"\, v. i.
   To discharge cannon; as, the army cannonaded all day.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cannonade
    n 1: intense and continuous artillery fire [syn: cannonade,
         drumfire]
    v 1: attack with cannons or artillery