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The eating of earthy substances, such as clay or chalk, practiced among various peoples as a custom or for dietary or subsistence reasons.

ge·oph′a·gism n.
ge·oph′a·gist n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
It's the kind of narratological metropolis inhabited by a dwarf tattooed head-to-foot with river maps, creatures called Mushroom Dwellers you just don't want to know too much about, a laughable and sad alcoholic father, a geophagist mother, and a masturbating saint.