Core

sb. the heart, central part of fruitEtymology: Old French cor; Latin cor

(a) The conductor or conductors of an electric cable. (See Cable Core)

(b) The iron mass, generally central in an electro-magnet or armature, around which the wire is coiled. It acts by its high permeance to concentrate or multiply the lines of force, thus maintaining a more intense field. (See Armature; Magnet; Magnet; Field; Laminated Core). In converters or transformers (See Converter) it often surrounds the wire coils.