'ultra-pasteurized' originates from the prefix 'ultra-' meaning 'beyond' and 'pasteurized' from the process named after Louis Pasteur, where 'pasteurize' meant 'to heat to destroy harmful microorganisms.'

'pasteurize' changed from the French word 'pasteuriser' and eventually became the modern English word 'pasteurize.'

Initially, it meant 'to heat to destroy harmful microorganisms,' and this meaning has largely remained the same in modern usage.