chemical antidote n.
A substance that unites with a poison to form an innocuous chemical compound.
For a chemical antidote in poisoning by carbonate of lead Dr. Taylor recommends a mixture of vinegar and sulphate of magnesia.
No chemical antidote had been either known or suggested until I made my accidental discovery.
After the soldiers were provided with proper respirators containing a chemical antidote, they were in no danger of being "gassed."