blowfish n 1: delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver [syn: {sea squab}, {puffer}] 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}, {globefish}] [also: {blowfishes} (pl)]