'high-acid' originates from the combination of 'high,' meaning 'great in amount or degree,' and 'acid,' from Latin 'acidus,' meaning 'sour or sharp.'

'Acidus' transformed into the Old French word 'acide,' and eventually became the modern English word 'acid.'

Initially, 'acid' meant 'sour or sharp,' and this meaning has largely remained the same in modern usage.