Meaning & use
serum
The clear, yellowish fluid that separates from blood when it clots, or a similar clear liquid used in medicine or skincare.
See it in a sentence
The lab tested the patient's blood serum for signs of infection.
She applies a vitamin C serum to her face every morning before moisturizer.
A note on using this word
In medicine, serum is the fluid part of blood after clotting factors are removed; in cosmetics, it describes a concentrated skincare liquid.
Words with a similar meaning
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