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Syrtis Major

[sur-tis]
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noun
  1. an area in the northern hemisphere and near 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. 2018
British Dictionary definitions for syrtis major

Syrtis Major

noun
  1. a conspicuous dark region visible in the N hemisphere of Mars
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012