In chemistry, a prefix or descriptor indicating the presence of an amide group or that a compound contains amide functionality.
From 'amide' shortened with '-o' (combining form), used in chemical compound names to indicate amide groups are present.
The prefix 'amido-' is shorthand in chemistry—when you see 'amidobenzoic acid,' you immediately know an amide group has replaced a hydrogen atom on benzoic acid, making nomenclature a kind of chemical shorthand language.
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