michelson-morley experiment

World English Dictionary
Michelson-Morley experiment (ˌmaɪkəlsənˈmɔːlɪ)
 
n
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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WordNet
michelson-morley experiment

noun
a celebrated experiment conducted by Albert Michelson and Edward Morley; their failure to detect any influence of the earth's motion on the velocity of light was the starting point for Einstein's theory of relativity 
WordNet® 3.0, © 2006 by Princeton University.
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