Definition of Michelson–Morley experiment in English:

Michelson–Morley experiment

Line breaks: Michelson–Morley ex|peri|ment
Physics
An experiment performed in 1887 which attempted to measure the relative motion of the earth and the ether by measuring the speed of light in directions parallel and perpendicular to the earth’s motion. The result disproved the existence of the ether, which contradicted Newtonian physics but was explained by Einstein’s special theory of relativity.

Origin

named after A. A. Michelson (see Michelson, Albert Abraham) and E. W. Morley (see Morley, Edward Williams).

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Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude