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Sinus Meridianii

[see-nuh s muh-rid-ee-ah-nee-ee, sahy-nuh s muh-rid-ee-ey-nee-ahy]
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noun
  1. an area on the equator of Mars, appearing as a dark region when viewed telescopically from the earth.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
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