'acid-stable' originates from the combination of 'acid,' from Latin 'acidus,' meaning 'sour,' and 'stable,' from Latin 'stabilis,' meaning 'firm or steadfast.'

'acidus' transformed into the Old French word 'acide,' and 'stabilis' became 'stable' in Middle English, eventually forming the modern English term 'acid-stable.'

Initially, 'acid' referred to sour substances, and 'stable' meant firm or steadfast. Together, they evolved to describe substances resistant to acidic conditions.