Pica
Part of speech: noun
Definition: A vitiated appetite that craves what is unfit for food, as chalk, ashes, coal, etc.; chthonophagia. A size of type. A unit of measure equivalent to 12 points. # The traditional British and American pica, about 4.22 mm, or 0.166 in (close to 1/6 of an inch). # The PostScript pica, 1/6 of an inch.
Geophagia
Part of speech: noun
Definition: Consumption of clay, chalk or dirt.