Definition of serum
- an antiaging facial serum
The patient was administered serum.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'serum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 1665See Words from the same year
What made you want to look up serum? Please tell us where you read or heard it (including the quote, if possible).