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Sinus Meridianii

[ 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 /
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noun
an area on the equator of Mars, appearing as a dark region when viewed telescopically from the earth.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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