The Collaborative International Dictionary of English v.0.48:

Puffer \Puff"er\, n.
   1. One who puffs; one who praises with noisy or extravagant
      commendation.
      [1913 Webster]

   2. One who is employed by the owner or seller of goods sold
      at suction to bid up the price; a by-bidder. --Bouvier.
      [1913 Webster]

   3. (Zool.)
      (a) Any plectognath fish which inflates its body, as the
          species of Tetrodon and Diodon of the family
          Tetraodontidae; -- called also blower,
          puff-fish, swellfish, and globefish. They are
          highly poisonous due to the presence of glands
          containing a potent toxin, tetrodotoxin.
          Nevertheless they are eaten as a delicacy in Japan,
          being prepared by specially licensed chefs who remove
          the poison glands.
      (b) The common, or harbor, porpoise.
          [1913 Webster]

   4. (Dyeing) A kier.
      [1913 Webster]

WordNet (r) 3.0 (2006):

puffer
    n 1: delicacy that is highly dangerous because of a potent nerve
         poison in ovaries and liver [syn: blowfish, sea squab,
         puffer, pufferfish]
    2: any of numerous marine fishes whose elongated spiny body can
       inflate itself with water or air to form a globe; several
       species contain a potent nerve poison; closely related to
       spiny puffers [syn: puffer, pufferfish, blowfish,
       globefish]