The Collaborative International Dictionary of English v.0.48:

Blimp \Blimp\ n. [from Colonel Blimp, a fictional character]
   any elderly pompous reactionary.

   Syn: Colonel Blimp.
        [WordNet 1.5]

   2. a small nonrigid airship used for observation or as a
      barrage balloon.

   Syn: sausage balloon, sausage.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Blimp
    n 1: any elderly pompous reactionary ultranationalistic person
         (after the cartoon character created by Sir David Low)
         [syn: Colonel Blimp, Blimp]
    2: a small nonrigid airship used for observation or as a barrage
       balloon [syn: blimp, sausage balloon, sausage]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "blimp":
   Bourbon, Colonel Blimp, Graf Zeppelin, aerostat, airship, ballonet,
   balloon, bloated aristocrat, captive balloon, diehard, dirigible,
   dirigible balloon, dumpling, fatty, fuddy-duddy, gasbag, heavy,
   heavyweight, hippo, lighter-than-air craft, lump, pilot balloon,
   potbelly, reactionarist, reactionist, rigid airship, roly-poly,
   royalist, sausage, semirigid airship, ship, stuffed shirt,
   swagbelly, tub, tub of lard, tun, ultraconservative,
   weather balloon, white, zeppelin