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Entry 1 sense Webster, 1913

Meg-

/(mÄ•g-)/ · IPA
01 Combining forms signifying: (a) Great, extended, powerful; as, megascope, megacosm.
  1. 1.
    Combining forms signifying: (a) Great, extended, powerful; as, megascope, megacosm.(Metric System, Elec., Mech., etc.)