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Dictionary

primor'dial soup'

Biol.
1. the seas and atmosphere as they existed on earth before the existence of life, consisting primarily of an oxygen-free gaseous mixture containing chiefly water, hydrogen, methane, ammonia, and carbon dioxide.
2. a laboratory preparation containing the substances believed to have composed primordial soup, and used in experiments seeking to understand the origin of life.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

primordial

primordium

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