define lysosomal
home / medterms medical dictionary a-z list / enzyme, lysosomal definition Medical Definition of Enzyme, lysosomal Enzyme, lysosomal: An enzyme in an organelle (a little organ) called the lysosome within the cell. Lysosomal enzymes degrade (break down) macromolecules (large molecules) and other materials (such as bacteria) that have been taken up by the cell during the process of endocytosis.