1. a substance that causes fever when introduced into the body
Usage: medical/scientific term
2. a substance that produces heat or fire
Usage: technical/chemistry

Examples

• Bacterial endotoxins are common pyrogens that trigger immune responses.
• The patient's fever was caused by a pyrogen released during the infection.
• Medical equipment must be sterilized to remove pyrogens.
• Certain contaminants act as pyrogens in injectable medications.
• The laboratory tested the solution for the presence of pyrogens.