Mare Serenitatis

[ suh-ren-i-tah-tis ]
/ səˌrɛn ɪˈtɑ tɪs /

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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020