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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.

The newly detected wake provides the strongest proof yet that a companion star is actively disturbing the atmosphere of this red supergiant.

From Science Daily • Jan. 10, 2026

These patterns provided strong evidence of the long-suspected companion star and revealed how it affects the red supergiant's outer atmosphere.

From Science Daily • Jan. 10, 2026

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

From Science Daily • Jan. 8, 2026

The companion star travels far from the system before plunging back through the dust-filled inner region.

From Science Daily • Dec. 17, 2025

This remarkable variable has a dark companion star revolving near it obscuring its light in part from us at stated intervals.

From A Field Book of the Stars by Olcott, William Tyler

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