disaccharidase - LMT

disaccharidase ??? - Janie

disaccharidase deficiency 

less than normal activity of the enzymes of the intestinal mucosa that cleave disaccharides, usually referring to a generalized deficiency of all such enzymes secondary to a disorder of the small intestine.

Hint:

Good reference source is to use the onelook.com dictionary wild card search:

          *ase deficiency

Found the above right away.