Definitions from Wiktionary (MASER)

▸ noun:  (physics) a device for the coherent amplification or generation of electromagnetic radiation (especially of microwave frequency) by the use of excitation energy in resonant atomic or molecular systems
▸ noun:  (astronomy) Any celestial object that generates microwaves using the same method
▸ noun:  Obsolete spelling of mazer. [(obsolete) The maple tree, or maple wood.]
▸ noun:  Acronym of microwave amplification by the stimulated emission of radiation.
▸ Also see maser

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