mildew

[mil-doo, -dyoo]
noun
1.
Plant Pathology. a disease of plants, characterized by a cottony, usually whitish coating on the surface of affected parts, caused by any of various fungi.
2.
any of these fungi. Compare downy mildew, powdery mildew.
3.
any of similar coatings or discolorations, caused by fungi, as that which appears on fabrics, paper, leather, etc., when exposed to moisture.
verb (used with object), verb (used without object)
4.
to affect or become affected with mildew.

Origin:
before 1000; Middle English: honeydew, mildew; Old English mildēaw, equivalent to mil- honey (cognate with Gothic milith, akin to Latin mel, Greek méli) + dēaw dew

mildewy, adjective
unmildewed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mildew (ˈmɪlˌdjuː)
 
n
1.  downy mildew See also powdery mildew any of various diseases of plants that affect mainly the leaves and are caused by parasitic fungi
2.  any fungus causing this kind of disease
3.  another name for mould
 
vb
4.  to affect or become affected with mildew
 
[Old English mildēaw, from mil- honey (compare Latin mel, Greek mēli) + dēawdew]
 
'mildewy
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

mildew
M.E. mildeu "honeydew, nectar," from O.E. mildeaw "honeydew" (sticky stuff exuded by aphids), from P.Gmc. compound of *melith "honey" + *dawwaz "dew" (cf. O.S. milidou, Du. meeldauw, Ger. Meltau "mildew"). First element in many cases assimilated to forms of meal "ground grain." Meaning "kind of fungus"
is first recorded mid-14c., so called from its being sticky and originally growing in plants. Related: Mildewed.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
mildew   (mĭl'd')  Pronunciation Key 
Any of various fungi or oomycete organisms that form a white or grayish coating on surfaces, such as plant leaves, cloth, or leather, especially under damp, warm conditions. Powdery mildews are important plant diseases usually caused by ascomycete fungi, while downy mildews, including a serious disease of grapevines, are caused by oomycetes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Easton
Bible Dictionary

Mildew definition


(the rendering of a Hebrew word meaning "to be yellow," yellowness), the result of cutting east winds blighting and thus rendering the grain unproductive (Deut. 28:22; 1 Kings 8:37; 2 Chr. 6:28).

Easton's 1897 Bible Dictionary
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Example sentences
And the office workers will begin complaining about mold and mildew.
Every day this guy fights off the bugs and mildew diseases inside his sealed,
  high-tech system.
Warm days and cool nights are ideal conditions for powdery mildew.
Moisture soaked through from the outside, and mildew covered the walls.
Images for mildew
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