Mare Serenitatis

[suh-ren-i-tah-tis]

Ma·re Se·ren·i·ta·tis

[suh-ren-i-tah-tis]
noun
(Sea of Serenity) a dark plain in the first quadrant of the face of the moon: about 120,000 sq. mi. (310,000 sq. km).
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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