maser

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maser

 [ma´zer]
a device that produces an extremely intense, small and nearly nondivergent beam of monochromatic radiation in the microwave region, with all the waves in phase.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.