megafarad

noun2

1. •
   An improbably large unit of electrical capacitance equal to one million farads.

   • 34. The capacitance unit of convenient size is (a) farad (b) microfarad (c) kilofarad (d) megafarad — 1997
2. •
   (no longer used) A unit of quantity of electric charge; the quantity of electricity flowing through a one megohm resistor when driven by an electromotive force of one volt for one second.

   • […] when electrotyping, electric light, &ᶜ become commercial we may perhaps buy a microfarad or megafarad of electricity […] — 1872