Synonyms

chain-reacting pile

chain-reacting pile

noun Physics.
reactor (def. 4).

Origin:
1945–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Chain-reacting pile is always a great word to know.
So is laser. Does it mean:
a quantized state in which matter may exist, having constant energy and separated from others in the series by finite quantities of energy
a device that produces a nearly parallel, monochromatic, coherent beam of light by exciting atoms to a higher energy level and causing them to radiate
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