'progressively-healed' originates from the combination of 'progressive' and 'heal', where 'progressive' means 'happening or developing gradually or in stages' and 'heal' means 'to become sound or healthy again'.

'Progressive' comes from the Latin word 'progressivus', and 'heal' comes from the Old English word 'hǣlan'.

Initially, 'progressive' meant 'moving forward', and 'heal' meant 'to make whole'. Over time, 'progressively-healed' evolved to describe a gradual healing process.