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VTOL
VTR
vu
vug
Vul.
Vulcan
vulcanian
vulcanicity
vulcanise
vulcanism
vulcanite
vulcanize
vulcanology
Vulg.
vulg.
vulgar
vulgar fraction
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VX

VX or VX gas


noun 
Definition:
 
nerve gas: a deadly human-made nerve agent that is odourless and tasteless and occurs as an amber oily liquid that evaporates slowly

[Mid-20th century. < code letters, V indicating that it is very persistent]
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