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Meaning of egg coal

egg' coal"

Pronunciation: [key]
  1. anthracite in sizes ranging from 3 to 2 in. (8 to 6 cm), intermediate between broken coal and stove coal.
  2. bituminous coal in sizes ranging from 4 to 1 in. (10 to 4 cm).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.