red dwarf

noun

: a star having substantially lower surface temperature, intrinsic luminosity, mass, and size than the sun

Examples of red dwarf in a Sentence

Recent Examples on the Web

Future simulations using the Smaller Than Earth Habitability Model could study worlds around smaller, cooler stars called red dwarfs — stars like TRAPPIST-1, which is home to at least seven rocky planets, with three of them in the habitable zone. — Kiona N. Smith, Space.com, 21 July 2026

Looking at a red dwarf improves matters, since there’s less light overall, and planets are relatively larger compared to these small stars. — John Timmer, ArsTechnica, 16 July 2026

It was discovered almost a decade ago, and orbits a small red dwarf star called LHS 1140, which is almost 49 light-years away from our solar system. — Doyle Rice, USA Today, 16 July 2026

About three out of every four stars in our galaxy are thought to be red dwarfs. — Jeffrey Kluger, Time, 16 July 2026

Word History

First Known Use

1926, in the meaning defined above

Rhymes for red dwarf

• morph
• orf
• wharf
• polymorph

Kids Definition

red dwarf

noun

: a star having much lower surface temperature, brightness, mass, and size than the sun