\Meg-\, Mega \Meg"a\, Megalo- \Meg"a*lo-\ [Gr. me`gas, gen.
mega`loy, great.]
Combining forms signifying:
(a) Great, extended, powerful; as, megascope, megacosm.
(b) (Metric System, Elec., Mech., etc.) A million times, a
    million of; as, megameter, a million meters; megafarad, a
    million farads; megohm, a million ohms.