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From Longman Dictionary of Contemporary Englishmaserma‧ser /ˈmeɪzə $ -ər/ noun [countable] technical  TPEa piece of equipment that produces a very powerful electric forcelaser
Examples from the Corpus
maserThe main maser features may have originated from the slowly rotating disk or from the outflow gas near the galactic nucleus.Other more recent tests involve direct comparison of the time-keeping of atomic clocks or of masers.Our observations of the maser emission were made from January to June 1992 with the Nobeyana 45-m telescope.
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