'rapidly-enlarged' is a compound word formed from 'rapidly' and 'enlarged'. 'Rapidly' originates from Latin 'rapidus', meaning 'seizing or grasping', and 'enlarged' comes from Old French 'enlargir', meaning 'to widen'.

'Rapidly' evolved from Latin 'rapidus' through Old French 'rapide', while 'enlarged' transformed from Old French 'enlargir' to Middle English 'enlargen'.

Initially, 'rapidly' meant 'seizing quickly', and 'enlarged' meant 'to make larger'. Together, they describe something that has grown in size quickly.