power-line

The compound noun "power-line" is a modern, transparent formation from two native English words. "Power" traces its lineage to the Latin concept of ability and control (posse), which evolved through Old French to signify force or energy, specifically electrical energy in the industrial age. "Line" originates from the Latin word for a linen thread (līnea), a concept extended to any long, thin mark or cord. The compound logically combines these elements in the late 19th/early 20th century to name the physical infrastructure—the line or cable—that conducts electrical power from generators to consumers, perfectly encapsulating its function through its constituent parts.

Structure: power (energy) + line (long mark or wire) power: From Anglo-Norman French poer, Old French povoir, from Vulgar Latin potēre, from Latin posse meaning "to be able". In this compound, it functions as a noun meaning "electrical energy". line: From Old English līne, from Latin līnea ("linen thread, string, mark"), from līnum ("flax"). In this compound, it functions as a noun meaning "a long, thin mark or structure, such as a wire or cable".