red dwarf

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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.

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Origin of red dwarf

First recorded in 1915–20

Words nearby red dwarf

red dog, red dogwood, red doll, red drum, red duster, red dwarf, rede, redear sunfish, red earth, redecorate, redeem

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use red dwarf in a sentence

Callingham and his collaborators are now trying to get more data from the most promising red dwarfs to see if and how their radio signals change over time, which could sort out whether they’re exoplanets.
These strange radio signals might not be coming from stars|Leto Sapunar|October 14, 2021|Popular-Science
He and his colleagues used a massive radio telescope called the Low Frequency Array or LOFAR to look at nearby red dwarfs in radio frequencies, and published their findings in the journal Nature Astronomy.
These strange radio signals might not be coming from stars|Leto Sapunar|October 14, 2021|Popular-Science
Thus, on average, red dwarfs should follow more elliptical orbits around the galaxy than young brown dwarfs do.
Here’s how cool a star can be and still achieve lasting success|Ken Croswell|August 23, 2021|Science News
On the positive side, red dwarfs abound, outnumbering all other stellar types put together, and brown dwarfs are also common.
Here’s how cool a star can be and still achieve lasting success|Ken Croswell|August 23, 2021|Science News

You might think that a smaller star would be a tamer star, but that’s actually not the case at all—red dwarfs produce stellar flares a lot more frequently than the sun does.
Massive Flare Seen Close to Our Solar System: What It Means for Chances of Alien Neighbors|R. O. Parke Loyd|May 5, 2021|Singularity Hub
Former Red Sox star Curt Schilling says his politics are keeping him out of Cooperstown.
Conservative Curt Says His Politics, Not His Pitching, Kept Him Out of the Hall of Fame|Ben Jacobs|January 9, 2015|DAILY BEAST
Nor does the jet have the ability to capture high-definition video, utilize an infra-red pointer.
Pentagon Misfires in Stealth Jet Scandal|Dave Majumdar|January 8, 2015|DAILY BEAST
There was deep brown flesh, and bronze flesh, and pallid white flesh, and flesh turned red from the hot sun.
Powerful Congressman Writes About ‘Fleshy Breasts’|Asawin Suebsaeng|January 7, 2015|DAILY BEAST
A Republican candidate hoping to win red state support could find a worse team to root for than one from Dallas.
Will Chris Christie Regret His Cowboy Hug?|Matt Lewis|January 5, 2015|DAILY BEAST
The pale, baby-faced, red-cheeked rapper is furiously puffing away at a hastily-made blunt crammed with low-grade weed.
The Cult of Yung Lean: ‘I’m Building An Anarchistic Society From the Ground Up’|Marlow Stern|January 4, 2015|DAILY BEAST
Beginners must be warned against mistaking the edges of cells, or particles which have retained the red stain, for bacilli.
A Manual of Clinical Diagnosis|James Campbell Todd
Under the internal pressure his whiskers stood on end and his face grew red.
The Bondboy|George W. (George Washington) Ogden
“You appear to feel it so,” rejoined Mr. Pickwick, smiling at the clerk, who was literally red-hot.
The Posthumous Papers of the Pickwick Club, v. 2(of 2)|Charles Dickens
Ripperda's eye fell upon the mantle,—it was discoloured a dark red in many places, he nodded his head, and the man withdrew.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
C was a Captain, all covered with lace; D was a drunkard, and had a red face.
Boys and Girls Bookshelf; a Practical Plan of Character Building, Volume I (of 17)|Various

British Dictionary definitions for red dwarf

red dwarf

noun

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

Scientific definitions for red dwarf

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.