mega-

mega- word element [Gr.], large; also used in naming units of measurement (symbol M) to designate an amount one million (106) times the size of the unit to which it is joined.

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mega-

pref.

1. Large: megacephaly.

2. One million (10⁶): megahertz.

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mega-, megalo-, mego-,

1 prefix meaning "great or huge": megacardia, megacoccus, megadyne.

2 a quantity one million times a given unit: megahertz.

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mega-

word element. [Gr.] large; used in naming units of measurement to designate an amount 10⁶ (one million) times the size of the unit to which it is joined, e.g. megacuries (10⁶ curies); abbreviation M.

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mega-

 Greek, big, abnormally large