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Mare Undarum

American  
[uhn-dahr-uhm] / ʌnˈdɑr əm /

noun

  1. (Sea of Waves ) a dark plain in the first quadrant of the face of the moon: about 4,800 sq. mi. (12,000 sq. km).

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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