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companion star

American

noun

Astronomy.

companion.

Etymology

Origin of companion star

First recorded in 1775–85

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

While observing a repeating FRB roughly 2.5 billion light-years from Earth, researchers detected a unique signal that pointed to the presence of a nearby companion star.

From Science Daily • Jan. 28, 2026

"One natural explanation is that a nearby companion star ejected this plasma," explained Professor Bing Zhang.

From Science Daily • Jan. 28, 2026

Gas from the companion star continuously flows toward the white dwarf.

From Science Daily • Jan. 8, 2026

Instead, they uncovered something unexpected: a companion star moving on a highly elongated orbit.

From Science Daily • Dec. 17, 2025

Nay, the movement of revolution has been decided before the companion star was discovered.

From Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work by Warren, Henry White

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023