Meson vs Maser - What's the difference?
meson | maser |
(rare, outside, entomology) The mesial plane dividing the body into similar right and left halves.
(obsolete) A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.)
(now specifically, particle) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.)
(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
(astronomy) Any celestial object that generates microwaves using the same method
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==Serbo-Croatian==
masseur