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The Collaborative International Dictionary of English v.0.48 (gcide)

Meg- \Meg-\ (m[e^]g-), Mega \Meg"a\ (m[e^]g"[.a]-), Megalo-
\Meg"a*lo-\ (m[e^]g"[.a]*l[-o]-). [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, megabyte, a million butes; megawatt, a
million watts; megameter, a million meters; megafarad, a
million farads; megohm, a million ohms.
[1913 Webster PJC] Megacephalic