• synonyms


  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.
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[lahys]Immunology, Biochemistry
verb (used with object), lysed, lys·ing.
  1. to cause dissolution or destruction of cells by lysins.
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verb (used without object), lysed, lys·ing.
  1. to undergo lysis.
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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).
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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 of lyses

  • 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
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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
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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.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

lyses in Medicine


  1. lysine
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(līs, līz)
  1. To undergo or cause to undergo lysis.
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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.
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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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.