circular mil

a unit used principally for measuring the cross-sectional area of wires, being the area of a circle having a diameter of one mil. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
circular mil
a unit of area of cross section of wire, equal to the area of a circle whose diameter is one thousandth of an inch. 1 circular mil is equal to 0.785 × 10--6 square inch or 0.2 × 10--9 square metre

Collins English Dictionary - Complete & Unabridged 10th Edition
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