'energy-transforming' is a compound word formed from 'energy' and 'transforming.' 'Energy' originates from Greek, specifically the word 'energeia,' meaning 'activity or operation.' 'Transforming' comes from Latin 'transformare,' where 'trans-' meant 'across' and 'formare' meant 'to form.'

'Energy' entered English via Old French 'energie' from Latin 'energia,' and 'transforming' came from Latin 'transformare' through Old French 'transformer.' The compound 'energy-transforming' is a modern English formation.

Initially, the parts meant 'activity' and 'to change form,' and together now refer to the process or property of changing energy from one form to another.