'allantochorion' originates from Greek, specifically the words 'allanto-' meaning 'sausage' and 'chorion' meaning 'membrane'.

'allantochorion' was derived from the Greek words 'allanto-' and 'chorion', and eventually became the modern English word 'allantochorion'.

Initially, it referred to a 'sausage-like membrane', but over time it evolved into its current meaning of a 'fetal membrane involved in nutrient exchange'.