Mare Tranquillitatis

[trang-kwil-i-tah-tis]

Ma·re Tran·quil·li·ta·tis

[trang-kwil-i-tah-tis]
noun
(Sea of Tranquillity) a dark plain in the first quadrant of the face of the moon: about 110,000 sq. mi. (285,000 sq. km).
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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