Having component parts separated by air; (Electricity, of an electrical device) having constituent elements spaced at intervals so that they are insulated from each other by air or the device has a lower capacitance.
Origin
1920s; earliest use found in The Times.
Definition of air-spaced in US English:
air-spaced
adjective
Having component parts separated by air; (Electricity, of an electrical device) having constituent elements spaced at intervals so that they are insulated from each other by air or the device has a lower capacitance.