'hyperacidity' originates from Greek and Latin: the prefix 'hyper-' comes from Greek 'hyper' where 'hyper' meant 'over, above', and 'acid' derives from Latin 'acidus' where 'acidus' meant 'sour'.

'hyperacidity' was formed in modern English by combining the Greek-derived prefix 'hyper-' with the noun 'acidity' (from Latin 'acidus' + suffix '-ity' from Latin '-itas'), producing the descriptive medical/chemical term 'hyperacidity'.

Initially, the components meant 'over' (hyper-) and 'sour' (acidus); the combined modern term has come to mean 'excess acidity' (often specifically referring to gastric acid excess).