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Sinus Meridianii

American  
[see-nuhs muh-rid-ee-ah-nee-ee, sahy-nuhs muh-rid-ee-ey-nee-ahy] / ˈsi nəs məˌrɪd iˈɑ niˌi, ˈsaɪ nəs məˌrɪd iˈeɪ niˌaɪ /

noun

  1. an area on the equator 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.