serum
//ˈsɪərəm//
Noun
serumSingular
serumsPlural
1
The clear, yellowish fluid that remains from blood after clotting factors and blood cells have been removed.
The laboratory analyzed the patient's serum to check for antibodies.
2
A liquid preparation containing antibodies, used for immunization or treatment of disease.
The doctor administered an antivenom serum to treat the snakebite.
3
A lightweight skincare product with concentrated active ingredients designed to penetrate the skin.
I apply a vitamin C serum every morning to brighten my skin.