serum.

1. The liquid separated from blood after it has clotted.

2. A blood-serum preparation containing antibodies for medical or laboratory use.

3. A relatively concentrated cosmetic preparation applied to skin or hair.

Use it for

Words that belong together

• blood serum
• a serum sample

On the page

The serum sample was separated from the clot.

They compared the blood serum with the control.

Usage notes

Primary category: horror. Forms: Usually mass; plural sera or serums for types, samples, or preparations. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.