se·rum
noun/ˈsɪərəm/
/ˈsɪrəm/
(plural sera
/ˈsɪərə/
/ˈsɪrə/
, serums)- [uncountable] (biology) the thin liquid that remains from blood when the rest has clotted
血清 - [uncountable, countable] (medical) serum taken from the blood of an animal and given to people to protect them from disease, poison, etc.
免疫血清 - snakebite serum
抗蛇毒血清
- snakebite serum
- [uncountable] any liquid like water in body tissue
浆液（体液的水样部分）
Word Originlate 17th cent.: from Latin, literally ‘whey’.