Meaning of Mare Nubium

Ma•re Nu•bi•um

Pronunciation: (mär'ā n'bē-um, ny'-, mâr'ē), [key]
  1. (Sea of Clouds) a dark plain in the third quadrant of the face of the moon: about 95,000 sq. mi. (245,000 sq. km).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.