a unit used principally for measuring the cross-sectional area of wires, being the area of a circle having a diameter of one mil.
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Example sentences from the Web for circular mil
The circular-mil area of a circular area, such as the cross section of a wire, can be found by squaring the diameter.Motion Picture Operation, Stage Electrics and Illusions|Henry C. Horstmann
British Dictionary definitions for 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012