VX

no evidence of venous invasion [TNM (tumor-node-metastasis) classification]; virus X

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VX 'vē-'eks n a cholinesterase inhibitor C₁₁H₂₆NO₂PS prepared and stockpiled for use in chemical warfare as a nerve gas

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an organophosphorus compound that is a potent cholinesterase inhibitor and is used as a nerve gas; symptoms of poisoning include bronchial constriction, convulsions, and often death. See organophosphorus compound poisoning, under poisoning.