An air-filled space forming the central core of a transformer, coil, etc. Chiefly attributive, designating a device having such a core, as opposed to a solid core of magnetic material.
Origin
Late 19th century. From air + core.
Definition of air core in US English:
air core
nounˈɛː kɔː
Electricity
An air-filled space forming the central core of a transformer, coil, etc. Chiefly attributive, designating a device having such a core, as opposed to a solid core of magnetic material.