a fungus, Aspergillus oryzae, used to initiate fermentation of a mixture of soybeans and wheat in the production of soy sauce.
Origin: < Japanese kōji malt, yeast < kaudi < kaũdi < kamudati, probably equivalent to *kamu (< *kanpu mold; compare kabu, a variant outcome of the same etymon) + -dati, combining form of tati to rise