Core

—1. The insulated electrical conductor of a cable, as distinguished from the outer covering or sheathing. y 2. The ma of iron forming the interior portion of an electromagnet, and around which the coils are wound. 3. The metallic body of a dynamo or motor armature upon which the windings are built up, 4. The bundle of iron wires upon which the primary and secondary coils of an induction coil or transformer are wound.