'acid-rich' is a compound word formed from 'acid' and 'rich'. 'Acid' originates from Latin 'acidus', meaning 'sour'. 'Rich' comes from Old English 'rice', meaning 'powerful' or 'wealthy'.

'Acid' evolved from Latin 'acidus' through Old French 'acide', while 'rich' evolved from Old English 'rice'.

Initially, 'acid' meant 'sour', and 'rich' meant 'wealthy'. Together, they describe something abundant in acid.