'rapidly-altered' originates from the combination of 'rapidly,' meaning 'quickly,' and 'altered,' meaning 'changed.'

'rapidly' comes from the Latin word 'rapidus,' meaning 'swift,' and 'altered' comes from the Latin word 'alterare,' meaning 'to change.'

Initially, 'altered' meant 'to change or modify,' and 'rapidly' meant 'quickly.' The combination retains the original meanings.