[ lahy-sis ]
/ ˈlaɪ sɪs /

noun, plural ly·ses [lahy-seez]. /ˈlaɪ siz/.

Immunology, Biochemistry. the dissolution or destruction of cells by lysins.
Medicine/Medical. the gradual recession of a disease.Compare crisis (def. 4).



Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
Question 1 of 13
How do you say “cat” 🐈 in Spanish?

Origin of lysis

1815–25; <New Latin <Greek lýsis a loosening, releasing, equivalent to ly-, variant stem of lȳ́(ein) to loosen, release + -sis-sis

Definition for lysis (2 of 2)


a combining form with the meaning “breaking down, loosening, decomposition,” used in the formation of compound words: analysis; electrolysis; paralysis.

Origin of -lysis

From Greek; see origin at lysis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for lysis

British Dictionary definitions for lysis (1 of 2)

/ (ˈlaɪsɪs) /

noun plural -ses (-siːz)

the destruction or dissolution of cells by the action of a particular lysin
med the gradual reduction in severity of the symptoms of a disease

Word Origin for lysis

C19: New Latin, from Greek, from luein to release

British Dictionary definitions for lysis (2 of 2)


n combining form

indicating a loosening, decomposition, or breaking downelectrolysis; paralysis

Word Origin for -lysis

from Greek, from lusis a loosening; see lysis
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 lysis (1 of 2)

[ līsĭs ]

n. pl. ly•ses (-sēz)

The gradual subsiding of the symptoms of an acute disease; a form of the recovery process.
The dissolution or destruction of cells, such as blood cells or bacteria, as by the action of a specific lysin.

Medical definitions for lysis (2 of 2)



Decomposition; dissolving; disintegration:hydrolysis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for lysis

[ līsĭs ]

The disintegration of a cell resulting from destruction of its membrane by a chemical substance, especially an antibody or enzyme.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.