'energy-reflective' originates from Modern English, formed as a compound of 'energy' and 'reflective'. 'energy' ultimately comes from Greek 'energeia' and 'reflective' comes from Latin 'reflectere' via Middle English.

'energy' originates from Greek 'energeia' (ἐνέργεια) meaning 'activity, operation', which passed into Late Latin as 'energia' and then into Modern English as 'energy'. 'reflective' derives from Latin 'reflectere' meaning 'to bend back' → Late Latin/Old French reflex- forms → Middle English 'reflect' and the adjectival suffix '-ive' produced 'reflective'. The compound 'energy-reflective' is a modern English formation combining these two elements.

Initially, 'energeia' meant 'activity' or 'operation' and 'reflectere' meant 'to bend back'; over time these roots produced 'energy' (capacity to do work/various forms of power) and 'reflective' (capable of sending back). The compound evolved to mean specifically 'capable of reflecting energy' in physical/technical contexts.