/ 5vAksi:n; [email protected] vAk5si:n; vAk`sin/ n [U, C] substance that is injected into the bloodstream and protects the body by making it have a mild form of the disease 疫苗; 菌苗: develop a smallpox, polio, rabies, etc vaccine 培养天花﹑ 小儿麻痹症﹑ 狂犬病等的疫苗. Cf 参看 serum2.