1. the clear yellowish fluid that separates from blood when it clots
Usage: medical
2. a liquid preparation containing antibodies used for immunization or treatment
Usage: medical
3. a cosmetic product designed to treat specific skin concerns
Usage: beauty; skincare

Examples

• The doctor ordered blood tests to analyze the patient’s serum.
• She received a tetanus serum after the injury.
• The antivenom serum saved the snakebite victim’s life.
• Her skincare routine includes a vitamin C serum.
• The facial serum helped reduce her wrinkles.
• Blood serum contains proteins and other nutrients.
• The laboratory tested the serum for antibodies.