blowfish

Short definition from Wiktionary

Noun

1. 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.
2. 2
   A delicacy popular in Japan, consisting of the fish served raw as sushi or perhaps fried. It may, if improperly prepared, contain considerably deadly levels of neurotoxins.

Proper noun

1. 1
   A symmetric block cipher encryption algorithm used in modern cryptographic software, designed by Bruce Schneier in 1993.