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  1. 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.
  1. to cause dissolution or destruction of cells by lysins.
verb (used without object), lysed, lys·ing.
  1. to undergo lysis.

Origin of lyse

1925–30; back formation from lysin or lysis


noun, plural ly·ses [lahy-seez] /ˈlaɪ siz/.
  1. Immunology, Biochemistry. the dissolution or destruction of cells by lysins.
  2. 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lyses

Historical Examples

  • We soon traversed the Champs lyses, and entered the open country.

    Tom Burke Of "Ours", Volume I (of II)

    Charles James Lever

  • It is as attractive as Unter den Linden or the Champs lyses.

    Rambles on the Riviera

    Francis Miltoun

  • What a crowd of them in the Champs lyses and out near the Bois.

    The Art of Entertaining

    M. E. W. Sherwood

  • Her cab passed the bridge of La Concorde and entered the Champs lyses.

    Two banks of the Seine

    Fernand Vandrem

  • If he's still alive, he lives in Paris, in a little street off the Champs lyses.


    George Du Maurier

British Dictionary definitions for lyses


  1. to undergo or cause to undergo lysis


noun plural -ses (-siːz)
  1. the destruction or dissolution of cells by the action of a particular lysin
  2. med the gradual reduction in severity of the symptoms of a disease

Word Origin

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


  1. lysine


(līs, līz)
  1. To undergo or cause to undergo lysis.


n. pl. ly•ses (-sēz)
  1. The gradual subsiding of the symptoms of an acute disease; a form of the recovery process.
  2. 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


  1. 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.