Plant Pathology.
the rapid and extensive discoloration, wilting, and death of plant tissues.
a disease so characterized.
any cause of impairment, destruction, ruin, or frustration: Extravagance was the blight of the family.
the state or result of being blighted or deteriorated; dilapidation; decay: urban blight.
verb (used with object)
to cause to wither or decay; blast: Frost blighted the crops.
to destroy; ruin; frustrate: Illness blighted his hopes.
verb (used without object)
to suffer blight.

1605–15; of uncertain origin

blightingly, adverb
unblighted, adjective
unblightedly, adverb
unblightedness, noun

2. curse, plague, scourge, bane. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blight (blaɪt)
1.  See also potato blight any plant disease characterized by withering and shrivelling without rotting
2.  any factor, such as bacterial attack or air pollution, that causes the symptoms of blight in plants
3.  a person or thing that mars or prevents growth, improvement, or prosperity
4.  an ugly urban district
5.  the state or condition of being blighted or spoilt
6.  to cause or suffer a blight
7.  (tr) to frustrate or disappoint
8.  (tr) to spoil; destroy
[C17: perhaps related to Old English blǣce rash; compare bleach]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1610s, origin obscure, apparently it emerged into literary speech from the talk of gardeners and farmers, perhaps ult. from O.E. blæce, blæcðu, a scrofulous skin condition and/or from O.N. blikna "become pale." Used in a general way of agricultural diseases, sometimes with suggestion
of "invisible baleful influence;" hence figurative sense of "anything which withers hopes or prospects or checks prosperity" (1852). The verb in this sense is from 1712. Hence slang blighter.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
blight   (blīt)  Pronunciation Key 
  1. Any of numerous plant diseases that cause leaves, stems, fruits, and tissues to wither and die. Rust, mildew, and smut are blights.

  2. The bacterium, fungus, or virus that causes such a disease.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Early blight is an increasingly important disease on potato.
You are a blight on this game.
Transformation Initiative have led to a decline in crime, elimination of
  blight, and an all-around sense of pride and renewal.
We're all under some kind of blight as adolescents.
Images for blight
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