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Mare Erythraeum

American  
[er-i-three-uhm] / ˌɛr ɪˈθri əm /

noun

  1. (Red Sea ) an area in the southern hemisphere of Mars, appearing as a dark region when viewed telescopically from the earth.

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