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Sinus Iridum

[see-nuh s ir-i-duh m, sahy-] /ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ-/
(Bay of Rainbows) a semicircular dark plain in the second quadrant of the face of the moon. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • The “moon maiden” is a term applied to a fancied resemblance of a portion of the Sinus Iridum to a female head.

    Astronomical Curiosities J. Ellard Gore

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