• (a.) Earth-eating.
Ge·oph'a·gous adjective Earth- eating. 
geophagous, geophage, geophagy 1. Feeding on soil; deriving nutrients from soil or the sediment. 2. Ingestion of earthy substances like clay; as a result of starvation, lack of something in the diet, or possibly as a result of mental illness. More details about geophagy.