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
Words nearby red dwarf
red devil,
red dog,
red dogwood,
red drum,
red duster,
red dwarf,
red dwarf ,
red earth,
red eft,
red emperor,
red ensign
British Dictionary definitions for red dwarf
red dwarf
noun
one of a class of small cool main-sequence stars
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.