1. a substance that neutralizes or opposes the action of another agent
Usage: medical; scientific

Examples

• The doctor administered a counteragent to neutralize the poison.
• Scientists developed a counteragent to block the harmful effects of the chemical.
• The counteragent successfully reversed the drug’s toxic reaction.
• Emergency responders carried counteragents for various chemical exposures.
• The new counteragent proved effective against the biological weapon.
• Researchers tested the counteragent’s ability to neutralize the toxin.