adjective Chemistry.

1870–75; < Greek theîon sulfur + -yl Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thionyl (ˈθaɪənɪl)
(modifier) Also: sulphinyl of, consisting of, or containing the divalent group SO: a thionyl group or radical; thionyl chloride
[C19 thion-, from Greek theion sulphur + -yl]

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Example sentences
The anode is made of lithium and the cathode is made of manganese dioxide, or sulfur dioxide, or thionyl chloride.
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