coal ball

From Wiktionary, the free dictionary
Archived revision by TheDaveBot (talk | contribs) as of 13:10, 26 May 2017.
Jump to navigation Jump to search

English

English Wikipedia has an article on:
Wikipedia

Alternative forms

Noun

coal ball (plural coal balls)

  1. A nodule of plant material permeated with minerals found mostly in bituminous and anthracite coal seams