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Meaning of Mare Crisium

Ma•re Cri•si•um

Pronunciation: (mär'ā krē'sē-um, mâr'ē), [key]
  1. (Sea of Crises) a dark plain in the first quadrant of the face of the moon: about 66,000 sq. mi. (170,000 sq. km).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.