coun·​ter·​agent | \ ˌkau̇n-tər-ˈā-jənt How to pronounce counteragent (audio) \
variants: or less commonly counter-agent
plural counteragents also counter-agents

Definition of counteragent

: someone or something that counteracts another: such as
a : an agent (see agent sense 2b) that works to diminish, counter, or offset the effects of another … said there have been multiple instances over the past year where officers, carrying Narcan, were first on the scene to an incident and were able to save an overdose victim's life by quickly administering the counteragent.— Amanda Ostuni
b : someone who acts against or exposes the activities of another agent There are similarities with … the way in which they took Rudolf Abel off the book and tried to turn him into a counteragent, to work for us.— Steven Spielberg There are two levels of narrative. On the psychological level, we learn the colonel inherited the manor when his murderous wife was committed to an asylum for the criminally insane. On the skullduggery level, a slew of characters are revealed to be secret agents and counteragents.— Dalt Wonk

First Known Use of counteragent

1821, in the meaning defined above

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The first known use of counteragent was in 1821

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to reflect, repel, echo, or resound

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