1. any species of fish of the family Tetraodontidae that have the ability to inflate themselves to a globe several times their normal size by swallowing water or air when threatened; puffer, blowfish, swellfish, balloonfish, globefish.
2. A delicacy popular in japan served raw as sushi that may, if improperly prepared, contain deadly levels of neurotoxins; (japanese) fugu.

1. 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
2. delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver