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Mare Humorum

[hyoo-mer-uh m, hyoo-mawr-, -mohr-]
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noun
  1. (Sea of Moisture) a dark plain in the third quadrant of the face of the moon: about 45,000 sq. mi. (117,000 sq. km).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018