acid radical
noun
1
: the negative ion (as the sulfate ion SO4−−) of an acid : anion
—now used especially by analysts
2
: a radical formed by removal of all hydroxyl or analogous groups (as mercapto) from an acid
benzoyl C6H5CO− is the acid radical corresponding to benzoic acid C6H5COOH
sulfuryl >SO2 is the acid radical of sulfuric acid H2SO4
compare acyl
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Merriam-Webster unabridged
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