- A saclike cellular organelle that contains various hydrolytic enzymes.
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
- A sac-like compartment inside a cell that has enzymes that can break down cellular components that need to be destroyed.
National Cancer Institute
- A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.
Definition from: Talking Glossary of Genetic Terms from the National Human Genome Research Institute
Related discussion in the Handbook
See also Understanding Medical Terminology.