allyl isothiocyanate

noun
allyl iso·thio·cy·a·nate | \ -ˌī-sō-ˌthī-ə-ˈsī-ə-ˌnāt, -nət \

Medical Definition of allyl isothiocyanate 

: a colorless pungent irritating liquid ester C4H5NS that is the chief constituent of mustard oil used in medicine and is used as a flavoring agent and as a medical counterirritant

called also allyl mustard oil

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occurring twice a year or every two years

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