'non-deaminating' originates from English, specifically the negative prefix 'non-' + the verb 'deaminate', where 'non-' meant 'not' and 'deaminate' is formed from the prefix 'de-' (from Latin meaning 'remove') + the element related to 'amine' (referring to amino groups).

'deaminate' was formed in scientific/medical New Latin from 'de-' + 'amine' (referring to amino compounds) and entered English in modern scientific usage; 'non-' was added as a productive English prefix to create 'non-deaminating'.

Initially, the element 'deaminate' meant 'to remove an amino group'; this core meaning has been retained in modern scientific usage, and 'non-deaminating' simply negates that action ('not removing an amino group').