
1) Impact crater on Mars 2) John william strutt 3) Lord rayleigh 4) Physicist 5) Third baron rayleigh
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https://www.crosswordclues.com/clue/rayleigh
[lunar crater] Rayleigh is a lunar crater that lies along the northeast limb of the Moon. This feature is seen edge-on from Earth, making it difficult to see much detail. In addition, libration effects can completely hide this crater from view. It lies just to the north of Lyapunov, and to the northwest of the large Joliot. Attached to its ...
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http://en.wikipedia.org/wiki/Rayleigh_(lunar_crater)
[unit] The rayleigh is a unit of photon flux, used to measure airglow (auroras, for example). It was first proposed in 1956 by D. M. Hunten, Franklin E. Roach, and J. W. Chamberlain. It is named for Robert John Strutt, 4th Baron Rayleigh (1875–1947). Its symbol is R (also used for the röntgen, an unrelated unit). SI prefixes are used wit...
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http://en.wikipedia.org/wiki/Rayleigh_(unit)

Type: Term Pronunciation: rā′lē Definitions: 1. John William Strutt, British physicist and Nobel laureate, 1842-1919. See: Rayleigh equation, Rayleigh test
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http://www.medilexicon.com/medicaldictionary.php?t=76011

[
n] - English physicist who studied the density of gases and discovered argon
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http://www.webdictionary.co.uk/definition.php?query=Rayleigh
Third Baron Rayleigh noun English physicist who studied the density of gases and discovered argon; made important contributions to acoustic theory (1842-1919)
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https://www.encyclo.co.uk/local/20974
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