Eating earth or clay or chalk

• Occurs in some primitive tribes or sometimes in cases of nutritional deficiency

Wikipedia Word definitions in Wikipedia
Geophagia (also known as geophagy ) is the practice of eating earth or soil-like substrates such as clay or chalk . It occurs in non-human animals where it may be a normal or abnormal behaviour, and also in humans, most often in rural or preindustrial societies ...

WordNet Word definitions in WordNet
n. eating earth or clay or chalk; occurs in some primitive tribes or sometimes in cases of nutritional deficiency [syn: geophagy , pica ]

Wiktionary Word definitions in Wiktionary
n. Consumption of clay, chalk or dirt.