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Sinus Meridianii

[see-nuh s muh-rid-ee-ah-nee-ee, sahy-nuh s 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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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5
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