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.
[1913 Webster]