The Collaborative International Dictionary of English v.0.48:

Broadside \Broad"side`\, n.
   1. (Naut.) The side of a ship above the water line, from the
      bow to the quarter.
      [1913 Webster]

   2. A discharge of or from all the guns on one side of a ship,
      at the same time.
      [1913 Webster]

   3. A volley of abuse or denunciation. [Colloq.]
      [1913 Webster]

   4. (Print.) A sheet of paper containing one large page, or
      printed on one side only; -- called also broadsheet.
      [1913 Webster]

WordNet (r) 3.0 (2006):

broadsheet
    n 1: an advertisement (usually printed on a page or in a
         leaflet) intended for wide distribution; "he mailed the
         circular to all subscribers" [syn: circular, handbill,
         bill, broadside, broadsheet, flier, flyer,
         throwaway]