serum
noun [ C or U ] uk/ˈsɪə.rəm/ us/ˈsɪr.əm/ sera uk/ˈsɪə.rə/ us/ˈsɪr.ə/ serums
(BLOOD)
血清
the thin yellowish liquid part of the blood
cholesterol levels in blood serum 血清中的胆固醇水平
免疫血清
serum taken from an animal's blood and put into a human in order to fight an infection or a poison
an anti-venom serum 抗蛇毒血清
(BEAUTY PRODUCT)
美容液（美容产品中的一种物质，用于改善头发或皮肤，减少干燥情况）
a substance in beauty products that is designed to improve your hair or skin and make it less dry