A most curious etymology.
From la wik:
Bradykinin was discovered in 1948 by three Brazilian physiologists and pharmacologists working at the Biochemistry and Pharmacology department of the Faculdade de Medicina de RibeirĂŁo Preto da Universidade de SĂŁo Paulo, in RibeirĂŁo Preto, SĂŁo Paulo, Brazil, led by Dr. MaurĂcio Rocha e Silva. Together with colleagues Wilson Teixeira Beraldo and GastĂŁo Rosenfeld, they discovered the powerful hypotensive effects of bradykinin in animal preparations. Bradykinin was detected in the blood plasma of animals after the addition of venom extracted from the Bothrops jararaca (Brazilian lancehead snake), brought by Rosenfeld from the Butantan Institute. The discovery was part of a continuing study on circulatory shock and proteolytic enzymes related to the toxicology of snake bites, started by Rocha e Silva as early as 1939. Bradykinin was to prove a new autopharmacological principle, i.e., a substance that is released in the body by a metabolic modification from precursors, which are pharmacologically active. According to B.J. Hagwood, Rocha e Silva's biographer, "The discovery of bradykinin has led to a new understanding of many physiological and pathological phenomena including circulatory shock induced by venoms and toxins." Etymology: brady [Gk] slow, kinin [Gk ] kÄ«n(eĂ®n) to move, set in motion, ? from the effect of snake venom on intestinal smooth muscle, which was noted to slowly contract.[25]