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air-core

[air-kawr, -kohr] /ˈɛərˌkɔr, -ˌkoʊr/
adjective, Electricity
1.
having a nonmagnetic core, as one of fiber or plastic, encircled by a coil (air-core coil) or containing one or more such coils:
air-core transformer.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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