serology, serological, serologic 1. A blood test to detect the presence of antibodies against a microorganism. 2. The branch of science concerned with serum, especially with specific immune or lytic serums; to measure either antigens or antibodies in sera. 3. The branch of medicine concerned with the study of blood serum and its constituents, esp... Found on http://www.wordinfo.info/words/index/info/view_unit/1945/