'anagrammatised' originates from English, specifically from the verb 'anagrammatise,' which is derived from 'anagram,' where 'ana-' meant 'up, back, again' and 'gramma' meant 'letter.'

'anagrammatise' was formed in English from 'anagram,' which itself comes from the French 'anagramme,' and ultimately from the Greek 'anagrammatismos.'

Initially, it meant 'to rearrange the letters of a word or phrase to form a new word or phrase,' and this meaning has remained the same in modern usage.