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Longman Dictionary of Contemporary English
mustard gas
noun
EXAMPLES FROM CORPUS
▪ Four kids to rear and a husband coughing away his lungs from mustard gas.
▪ Gene mutations occur spontaneously and can be induced by mutagenic agents such has high temperature, mustard gas, and radiation.
▪ It was called mustard gas and was used at Ypres in 1917, when it caused many thousands of casualties.
▪ The leaves of cabbages, mustard and some other brassicas contain toxic mustard oil, similar to the deadly mustard gas.
▪ The world greeted the news as if President Tucker had reintroduced mustard gas.
Wiktionary
mustard gas

n. A vesicant gas, bis (2-chloroethyl) sulfide, (ClC2H4)2S, once used in chemical warfare.

WordNet
mustard gas

n. a toxic war gas with sulfide based compounds that raises blisters and attacks the eyes and lungs; there is no known antidote [syn: mustard agent, blistering agent, dichloroethyl sulfide, sulfur mustard]

Usage examples of "mustard gas".

He killed him, and Basser Assad, with the very mustard gas which was being produced in the facility.

If Forrester says he can make napalm and bombs and mustard gas, he can do it.

The question probably meant another mustard gas bombardment was laid on as part of the attack.

The mustard gas is corrosive and I'd be surprised if any is left that hasn't eaten its way through the containers, without preventative maintenance.

In the Vienna Hilton, Fahd asked her to buy a couple of tonnes of thionyl chloride, a `building-block' chemical used in the manufacture of many legitimate products but also an essential basic ingredient for the manufacture of mustard gas and nerve agents such as sarin.

For a minute I am looking straight down at the moonlit phosgene clouds -- green as mustard gas in the lying moonlight -- then we are both racketing around a series of spirals, DNA-HELIX switchbacks, our sleds teetering on the edge of each bank so that twice my ice-axe blade bites into nothing but freezing air, but both times we drop back down and emerge -- not exiting the turns so much as being spit out of them, two rifle bullets fired just above the ice -- and then we bank high again, come out accelerating onto a straight, and shoot across eight kilometers of sheer ice wall on the .

He could smell the noxious aroma of the passed gas and could almost see that, too, rising in filthy dark yellow streamers, like mustard gas.

Yes, and since we are talking of the Chateau Mirandol, who spread the mustard gas upon the gate, and why?

Currently, we only have it in mustard gas, which is a very simple material, but we may have it in VX or Sarin soon.

I get drunk, and I drive my wife away with a breath like mustard gas and roses.

He asked her, that morning, if there were shelters which the winged people had constructed as proof against the heavy clouds of mustard gas that had been flushed through their cities by the Alliance troops.

Its odor, its effects, are almost exactly like mustard gas, with which most persons are familiar.

Made it up like mustard gas, or to imitate mustard gas, I mean, so it would scare the victims worse.

Hence the omission of the ingredients of mustard gas here, although the formula is a widely known one.