/ˈsɪərəm ||; ˈsɪrəm/noun (
plural sera /-rə
||; -rə/
or serums)
1 [U] (medical医学) the thin liquid that is left after blood has CLOTTED(= formed thick lumps) 血清
2 [U] [C] a liquid that is taken from the blood of an animal and given to people to protect them from disease, poison, etc 免疫血清；抗毒血清