isohemagglutination
noun
iso·hem·ag·glu·ti·na·tion
variants:
or chiefly British isohaemagglutination \ ˌī-sō-ˌhē-me-ˌglüt-ᵊn-ˈā-shən 
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Medical Definition of isohemagglutination
: isoagglutination of red blood cells