a river in W Europe, in N France and W Belgium, flowing NE into the Scheldt River at Ghent. 120 miles (195 km) long.


[lahys]Immunology, Biochemistry

verb (used with object), lysed, lys·ing.

to cause dissolution or destruction of cells by lysins.

verb (used without object), lysed, lys·ing.

to undergo lysis.

Origin of lyse

1925–30; back formation from lysin or lysis



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).

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lyses

Historical Examples of lyses

British Dictionary definitions for lyses



to undergo or cause to undergo lysis


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
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 lyses



1927, back-formation from lysis.



"dissolution of cells, bacteria, etc.," 1902, from Latin lysis, from Greek lysis "a loosening," from lyein "to unfasten, loose, loosen, untie" (see lose).

Online Etymology Dictionary, © 2010 Douglas Harper

lyses in Medicine





[līs, līz]


To undergo or cause to undergo lysis.



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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

lyses in Science



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.