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Sinus Iridum

[see-nuh s ir-i-duh m, sahy-] /ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ-/
noun
1.
(Bay of Rainbows) a semicircular dark plain in the second quadrant of the face of the moon.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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