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coal ball

American  

noun

  1. a spherical mass of mineral and plant material embedded in coal beds, ranging in size from that of a pea to that of a boulder.

Etymology

Origin of coal ball

First recorded in 1735–45

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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