- any star with a low surface temperature and a reddish color, as a red giant or a red dwarf.
Origin of red star
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for red star
One is the F. of hydrogen; another is the red-star line of Jupiter and Saturn.History of Astronomy