'amniotin' originates from 'amniotic,' specifically the word 'amnion,' where 'amnion' meant 'membrane surrounding the fetus.'

'amnion' transformed into the modern English word 'amniotic,' and eventually led to the creation of 'amniotin.'

Initially, it referred to the membrane surrounding the fetus, but over time it evolved into its current meaning of a protein found in the amniotic fluid.