'moisture-resistant' originates from the combination of 'moisture' and 'resistant', where 'moisture' refers to 'water or other liquid diffused in a small quantity as vapor' and 'resistant' means 'able to withstand or oppose'.

'moisture' comes from the Latin word 'mōistūra', and 'resistant' is derived from the Latin 'resistere', meaning 'to withstand'.

Initially, 'resistant' meant 'to withstand or oppose', and this meaning has largely remained the same in modern usage.