a person or thing that puffs.
Also called blowfish, globefish. any of various fishes of the family Tetraodontidae, capable of inflating the body with water or air until it resembles a globe, the spines in the skin becoming erected: several species contain the potent nerve poison tetrodotoxin.

1620–30; puff + -er1

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World English Dictionary
puffer (ˈpʌfə)
1.  a person or thing that puffs
2.  Also called: globefish any marine plectognath fish of the family Tetraodontidae, having an elongated spiny body that can be inflated to form a globe

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Example sentences
Similar efforts are under way with plant toxins, and with poisons extracted
  from shellfish and puffer fish.
There have been hundreds of recalls in the past two years alone including one
  for mislabeling poisoned puffer fish as monkfish.
In the meantime, fishermen stab the puffer and throw it back into the water.
Puffer fish are themselves impervious to tetrodotoxin because of a point
  mutation in their sodium channel receptors.
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