[pawrt-man-toh] It would be a terrible shame if portmanteau were not itself a portmanteau. The word originally referred to a large traveling case made of stiff leather, derived from a combination of the French porter, meaning "to carry," and manteau, meaning "mantle" or "cloak."
The word's literary
significance is the work of Lewis Carroll. In Through the
Looking-Glass, Humpty Dumpty explains to Alice that the strange
compound words she hears in Wonderland are "like a
portmanteau--there are two meanings packed up into one word."