A unit of electrical capacitance equal to one billionth (10^-9) of a farad, primarily used in the centimeter-gram-second (CGS) system of units.
From the prefix ab- (meaning one ten-billionth in the CGS electromagnetic system) + farad (the standard SI unit of capacitance, named after physicist Michael Faraday). The CGS system created many 'ab-' prefixed units.
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