album græcum

from The Century Dictionary.

• noun The dung of dogs, etc., which, from exposure to the air, has become white like chalk. It was formerly used as a medicine, and is still used by tanners to soften leather.

from the GNU version of the Collaborative International Dictionary of English.

• Dung of dogs or hyenas, which becomes white by exposure to air. It is used in dressing leather, and was formerly used in medicine.