A megamaser is a type of astrophysical maser, which is a naturally occurring source of stimulated spectral line emission. Megamasers are distinguished from astrophysical masers by their large isotropic luminosity. Megamasers have typical luminosities of 103 solar luminosities (L☉), which is 100 million times brighter than masers in the Milky Way...
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http://en.wikipedia.org/wiki/Megamaser
An extremely powerful maser associated with an active galactic nucleus. Megamasers, the most powerful of which are the OH (hydroxyl) and H
2O megamasers, are up to a million times more powerful than stellar masers found within the Milky Way Galaxy.
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http://www.daviddarling.info/encyclopedia/M/megamaser.html
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