The Collaborative International Dictionary
Chthonophagy
Chthonophagia \Chthon`o*pha"gi*a\, Chthonophagy \Chtho*noph"a*gy\, n. [NL. chthonophagia; Gr. ?, ?, earth + ? to eat.] A disease characterized by an irresistible desire to eat earth, observed in some parts of the southern United States, the West Indies, etc.
Wiktionary
chthonophagy
n. (context disease English) (alternative form of chthonophagia English)