noun Cell Biology.

a cell organelle containing enzymes that digest particles and that disintegrate the cell after its death.

Origin of lysosome

First recorded in 1950–55; lyso- + -some3
Related formsly·so·so·mal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for lysosome



any of numerous small particles, containing digestive enzymes, that are present in the cytoplasm of most cells
Derived Formslysosomal, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lysosome

1955, from lyso- + -some (3).

Online Etymology Dictionary, © 2010 Douglas Harper

lysosome in Medicine




A membrane-bound organelle in the cytoplasm of most cells containing various hydrolytic enzymes that function in intracellular digestion.
Related formsly′so•somal adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

lysosome in Science



A cell organelle that is surrounded by a membrane, has an acidic interior, and contains hydrolytic enzymes that break down food molecules, especially proteins and other complex molecules. Lysosomes fuse with vacuoles to digest their contents. The digested material is then transported across the organelle's membrane for use in or transport out of the cell. See more at cell.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.