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Messier number

American  

noun

Astronomy.

  1. a number (preceded by M) designating the 109 double stars, clusters, nebulae, and galaxies in the Messier catalog.

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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.

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