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British Dictionary definitions for michelson-morley experiment

Michelson-Morley experiment

noun
  1. an experiment first performed in 1887 by A. A. Michelson and E. W. Morley, in which an interferometer was used to attempt to detect a difference in the velocities of light in directions parallel and perpendicular to the earth's motion. The negative result was explained by the special theory of relativity
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