'omnivorous' originates from Latin, specifically the word 'omnivorus,' where 'omni-' meant 'all' and 'vorare' meant 'to devour.'

'omnivorus' transformed into the English word 'omnivorous,' and eventually became the modern English word 'omnivorousness' through the addition of the suffix '-ness.'

Initially, it meant 'devouring all kinds of food,' and this meaning has largely remained the same in modern usage.