Mare Tranquillitatis

[ trang-kwil-i-tah-tis ]
/ træŋˌkwɪl ɪˈtɑ tɪs /


(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).


Can You Ace This Quiz About “Compliment” vs. “Complement”?
Take this quiz to see if you really know the difference between “compliment” and “complement"!
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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020