n.反应素，梅毒反应素，变应性反应素； 英英释义： reagin[ ri:'eidʒin, -ɡin, 'ri:ədʒin ]n.an immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the loc