The Collaborative International Dictionary of English v.0.48:

Brochure \Bro*chure"\, n. [F., fr. brocher to stitch. See
   Broach, v. t.]
   A printed and stitched book containing only a few leaves; a
   pamphlet; a single sheet folded to make four pages.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

brochure
    n 1: a small book usually having a paper cover [syn: booklet,
         brochure, folder, leaflet, pamphlet]