mildew

1 of 2

noun

mil·​dew ˈmil-ˌdü 

-ˌdyü

1

a

: a superficial usually whitish growth produced especially on organic matter or living plants by fungi (as of the families Erysiphaceae and Peronosporaceae)

b

: a fungus producing mildew

2

: a discoloration caused by fungi

mildewy

ˈmil-ˌdü-ē 

-ˌdyü-

adjective

mildew

2 of 2

verb

mildewed; mildewing; mildews

transitive verb

: to affect with or as if with mildew

intransitive verb

: to become affected with mildew

Examples of mildew in a Sentence

Noun

The basement's damp walls were covered with mildew.

Recent Examples on the Web

Noun

The hypoallergenic material protects your pillows from dust, dander, mold, mildew, and pollen. —Alida Nugent, Better Homes & Gardens, 4 June 2024

Also, rinse leaves with water early in the day to wash away mildew spores. —Nan Sterman, San Diego Union-Tribune, 1 June 2024

Verb

Soggy drywall eventually gets replaced, only to grow damp and mildewed again within months. —Curbed, 9 Jan. 2024

The Issue: Mildew If the grout is mildewed or badly stained, mix a 50/50 solution of oxygen bleach and water, and apply it with a sponge or pump-up sprayer. —Joseph Truini, Popular Mechanics, 5 Dec. 2018

Word History

Etymology

Noun

Middle English, from Old English meledēaw honeydew; akin to Old High German militou honeydew

First Known Use

Noun

14th century, in the meaning defined at sense 1a

Verb

1552, in the meaning defined at transitive sense

Phrases Containing mildew

• downy mildew
• powdery mildew

Kids Definition

mildew

1 of 2 noun

mil·​dew ˈmil-ˌd(y)ü 

: a usually whitish growth produced on decaying material or living plants by fungi

also : a fungus producing mildew

mildewy

-ˌd(y)ü-ē 

adjective

mildew

2 of 2 verb

: to affect with or become affected with mildew

Medical Definition

mildew

noun

mil·​dew ˈmil-ˌd(y)ü 

1

: a superficial usually whitish growth produced especially on organic matter or living plants by fungi (as of the families Erysiphaceae and Peronosporaceae)

2

: a fungus producing mildew