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Meaning of Mare Humorum

Ma're Hu'mo•rum

Pronunciation: (hy'mur-um, hy-môr'-, -mōr'-), [key]
  1. (Sea of Moisture) a dark plain in the third quadrant of the face of the moon: about 45,000 sq. mi. (117,000 sq. km).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.