Oceanus Procellarum

[ oh-see-ah-nuhs -proh-suh-lahr-uhm, -an-uhs, oh-shee- ]
/ ˌoʊ siˈɑ nəs ˌproʊ səˈlɑr əm, -ˈæn əs, ˌoʊ ʃi- /

noun

(Ocean of Storms) the largest dark plain on the face of the moon, in the second and third quadrants: about 2 million square miles (5.2 million sq. km).

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