'non-amidated' is formed from the prefix 'non-' meaning 'not' and the adjective 'amidated', which comes from 'amide', a chemical compound containing a carbonyl group linked to a nitrogen atom.

'Amidated' comes from 'amide', which itself is derived from the French 'amide', from the Latin 'ammoniacum', referring to ammonium compounds. The prefix 'non-' was added in modern scientific English to indicate the absence of amidation.

Initially, 'non-amidated' simply described a chemical substance that had not been amidated, and this meaning has remained consistent in scientific usage.