What is a colorless oily liquid, (C2H5)2S2, having a strong garlic odor; -- called also ethyl disulphide. By extension, any one of the series of related compounds called?

thialol — A colorless oily liquid, (C2H5)2S2, having a strong garlic odor; -- called also ethyl disulphide. By extension, any one of the series of related compounds. (Webster's 1913.)

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