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serotherapy
serotherapy n.
Brit. 
/ˌsɪərəʊˈθɛrəpi/
, /ˌsɪərəʊˈθɛrəpi/U.S. /ˌsɪroʊˈθɛrəpi/
treatment of disease or infection by serums, serum-therapy./ˌsɪroʊˈθɛrəpi/ΚΠ
1894 Brit. Med. Jrnl. 3 Nov. 1008 The series of discoveries which finally led to that of the serotherapy.
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