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[dih-zeezd] /dɪˈzizd/
having or affected with disease.
Origin of diseased
late Middle English
1425-75; late Middle English disesed; compare Anglo-French diseasé. See disease, -ed2
Related forms
nondiseased, adjective
undiseased, adjective
Can be confused
deceased, diseased.


[dih-zeez] /dɪˈziz/
a disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.
any abnormal condition in a plant that interferes with its vital physiological processes, caused by pathogenic microorganisms, parasites, unfavorable environmental, genetic, or nutritional factors, etc.
any harmful, depraved, or morbid condition, as of the mind or society:
His fascination with executions is a disease.
decomposition of a material under special circumstances:
tin disease.
verb (used with object), diseased, diseasing.
to affect with disease; make ill.
1300-50; Middle English disese < Anglo-French dese(a)se, disaise; see dis-1, ease
Related forms
diseasedly, adverb
diseasedness, noun
1. morbidity, complaint, derangement, distemper, indisposition, infirmity, disorder, malady.
1. health. 5. cure. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for diseased
  • All your story is managing to do is make people think that adopting a lot of diseased cats is somehow going to fix the problem.
  • It spreads through skin-to-skin contact or when there is a diseased amphibian in a shared water source.
  • Those that remained were diseased or fed the local squirrels.
  • As you clean out the summer garden, pile everything but diseased material onto the compost pile.
  • There's no point in wasting water by trying to keep alive scraggly or diseased plants.
  • Most of the food animals fed antibiotics are not diseased.
  • The river is diseased, and the stench of sewage is inescapable.
  • Perhaps the tissue has become diseased from too rapid growth and too rich food.
  • It seemed to be a sort of monster, or symbol representing a monster, of a form which only a diseased fancy could conceive.
  • He announces that contemporary music has become a diseased, degenerate world in need of a cleansing solution.
British Dictionary definitions for diseased


having or affected with disease


any impairment of normal physiological function affecting all or part of an organism, esp a specific pathological change caused by infection, stress, etc, producing characteristic symptoms; illness or sickness in general
a corresponding condition in plants
any situation or condition likened to this: the disease of materialism
adjective pathological
Word Origin
C14: from Old French desaise; see dis-1, ease
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
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Word Origin and History for diseased

late 15c., past participle adjective from Middle English verb disesen "to make uneasy; inflict pain" (mid-14c.), later "to have an illness or infection" (late 14c.); "to infect with a disease" (late 15c.), from disease (n.).



early 14c., "discomfort, inconvenience," from Old French desaise "lack, want; discomfort, distress; trouble, misfortune; disease, sickness," from des- "without, away" (see dis-) + aise "ease" (see ease). Sense of "sickness, illness" in English first recorded late 14c.; the word still sometimes was used in its literal sense early 17c.

Online Etymology Dictionary, © 2010 Douglas Harper
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diseased in Medicine

diseased dis·eased (dĭ-zēzd')

  1. Affected with disease.

  2. Unsound or disordered.

disease dis·ease (dĭ-zēz')
A pathological condition of a body part, an organ, or a system resulting from various causes, such as infection, genetic defect, or environmental stress, and characterized by an identifiable group of signs or symptoms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang definitions & phrases for diseased


Related Terms

foot-in-mouth disease

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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