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red dwarf

noun, Astronomy.
any of the faint reddish stars having diameters about half that of the sun and low surface temperatures, about 2000–3000 K; a main sequence star of spectral type M.
Origin of red dwarf
First recorded in 1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for red dwarf
Contemporary Examples
Historical Examples
  • They were approaching a red dwarf, the only planet-bearing sun in the vicinity.

    One Man's Poison Robert Sheckley
  • The time required for the evolution of a star from red giant to red dwarf is not known, but it must be very great.

    Astronomy for Young Folks Isabel Martin Lewis
  • The spines of a million needle-sharp mountains glittered in the red dwarf's feeble light.

    One Man's Poison Robert Sheckley
British Dictionary definitions for red dwarf

red dwarf

one of a class of small cool main-sequence stars
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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red dwarf in Science
red dwarf  
A small, dim star with relatively cool surface temperatures, positioned to the lower right on the main sequence in the Hertzsprung-Russell diagram. Red dwarfs, at about 0.1 to 0.5 solar mass, consume their nuclear fuel very slowly and live for about 100 billion years. Although they are difficult to see, they are so long-lived that they are likely the most abundant type of star; of the 30 nearest stars to Earth, 21 are red dwarfs, including the closest star, Proxima Centauri. See Note at dwarf star.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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