'allantoinuria' originates from 'New Latin', specifically the word 'allantois', where 'allanto-' referred to the fetal membrane and '-uria' meant 'urine condition'.

'allantois' transformed into the term 'allantoin' in scientific contexts, and eventually became the modern medical term 'allantoinuria'.

Initially, it referred to the presence of allantoin in the urine, and this meaning has largely remained the same in modern medical usage.