Bible Dictionaries
Thionyl
Webster's Dictionary
 (n.) The hypothetical radical SO, regarded as an essential constituent of certain sulphurous compounds; as, thionyl chloride.
 
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 Bibliography Information
Webster, Noah. Entry for 'Thionyl'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/thionyl.html. 1828.