'non-acidic' originates from the prefix 'non-' meaning 'not' and 'acidic' from Latin 'acidus' meaning 'sour'.

'acidus' transformed into the English word 'acidic', and with the addition of 'non-', it became 'non-acidic'.

Initially, 'acidic' meant 'sour', but 'non-acidic' evolved to mean 'not having the properties of an acid'.