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Tombaugh

[tom-baw] /ˈtɒm bɔ/
noun
1.
Clyde William, 1906–97, U.S. astronomer: discovered Pluto 1930.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for c w tombaugh

Tombaugh

/ˈtɒmbəʊ/
noun
1.
Clyde William. 1906–97, US astronomer, who discovered (1930) the dwarf planet Pluto
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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c w tombaugh in Science
Tombaugh
  (tŏm'bô')   
American astronomer who discovered the planet Pluto in 1930. The existence of an outermost planet, known as Planet X, had been predicted some years earlier by the American astronomer Percival Lowell based on apparent perturbations in the orbits of Neptune and Uranus. Tombaugh's careful analysis of celestial photographs did reveal a new planetary body, although it was too small to have caused the perturbations. Planet X itself was never found.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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