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Mare Boreum

American  
[bawr-ee-uhm, bohr-] / ˈbɔr i əm, ˈboʊr- /

noun

  1. (Northern Sea ) an area near the north pole of Mars, appearing as a dark region when viewed telescopically from the earth.

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.