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blue straggler

American  

noun

Astronomy.

  1. one of a small group of blue stars within a cluster that falls near the main sequence even though other stars of its color have evolved off the main sequence.

Etymology

Origin of blue straggler

First recorded in 1965–70

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.