[ lahy-suh-sohm ]
/ ˈlaɪ səˌsoʊm /

noun Cell Biology.

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


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Origin of lysosome

First recorded in 1950–55; lyso- + -some3


ly·so·so·mal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for lysosome

/ (ˈlaɪsəˌsəʊm) /


any of numerous small particles, containing digestive enzymes, that are present in the cytoplasm of most cells

Derived forms of lysosome

lysosomal, 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

Medical definitions for lysosome

[ līsə-sōm′ ]


A membrane-bound organelle in the cytoplasm of most cells containing various hydrolytic enzymes that function in intracellular digestion.

Other words from lysosome

ly′so•somal adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for lysosome

[ līsə-sōm′ ]

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.