/ Dictionary / Index A air-core: Meaning and Definition of Find definitions for: air-core Pronunciation: (âr'kôr", -kōr"), [key] — adj. Elect. having a nonmagnetic core, as one of fiber or plastic, encircled by a coilor containing one or more such coils: air-core transformer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. air-cool Air Corps Related Content Daily Word Quiz: pudgy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language