[ vey-pawr-uh m, -pohr- ]
/ veɪˈpɔr əm, -ˈpoʊr- /
(Sea of Vapors) a dark plain in the first quadrant and near the center of the face of the moon: about 39,000 sq. mi. (101,000 sq. km).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019