air gap
noun
Definition of air gap
1 : an air-filled gap in a magnetic or electric circuit (as the space between the field-magnet poles and the armature in a dynamo or motor)
2 : wind gap
3 : the vertical distance between the point where water enters a plumbing fixture (as a tub) and the level at which it would overflow
From the M-W Editors
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First Known Use of air gap
1878
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