countervenomn.
rare.
= counterpoison n.; but in quot. 1854 = A venom or poison used as an antidote to another poison.
ΚΠ
1854 T. De Quincey On War in Select. Grave & Gay IV. 266 A counter-venom to the taint of some more mortal poison.
This entry has not yet been fully updated (first published 1893; most recently modified version published online June 2019).
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n.1854