Etymology
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blowfish (n.)

also blow-fish, 1862, American English, from blow (v.1) + fish (n.).

Then he described another odd product of the bay, that was known as the blow-fish, and had the power of inflating himself with air when taken out of the water. ["The Young Nimrods in North America," New York, 1881]

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Definitions of blowfish

blowfish (n.)
delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver;
Synonyms: sea squab / puffer / pufferfish
blowfish (n.)
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;
Synonyms: puffer / pufferfish / globefish
From wordnet.princeton.edu