Dictionary![]() ![]() Pla•toPronunciation: (plā'tō), [key] —n. 1. 427–347b.c.,Greek philosopher. 2. a walled plain in the second quadrant of the face of the moon, having a dark floor: about 60 miles (96 km) in diameter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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