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[mohl-dee] /ˈmoʊl di/
adjective, moldier, moldiest.
overgrown or covered with mold.
musty, as from decay or age.
Informal. old-fashioned; outmoded:
moldy ideas about higher education.
Origin of moldy
1350-1400; Middle English; see mold2, -y1
Related forms
moldiness, noun
unmoldy, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for moldy
  • moldy or musty odors are an indicator that there may be hidden mold growth.
  • It's the same dynamic that fills the office refrigerator with old yogurt containers and moldy lunches.
  • Staff members say the rainy season, with its mosquito swarms and moldy clothes, attracts the toughest volunteers.
  • moldy soft cheese can also have bacteria growing along with the mold.
  • Avoid touching mold or moldy items with your bare hands.
  • Once identified, you should clean, disinfect and dry the moldy area.
  • When working around moldy areas, use respiratory protection.
  • Paint applied over moldy surfaces is likely to peel.
  • Collect moldy materials such as ceiling tiles and carpet and dispose of it in plastic garbage bags.
  • For moldy wood, clean it with soap and water and elbow grease.
British Dictionary definitions for moldy


adjective moldier, moldiest
the US spelling of mouldy
Derived Forms
moldiness, noun


adjective mouldier, mouldiest (US) moldier, moldiest
covered with mould
stale or musty, esp from age or lack of use
(slang) boring; dull
Derived Forms
mouldiness, (US) moldiness, noun
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 moldy

also mouldy, 1570s, earlier mowly (late 14c.), from mold (n.2) + -y (2). Related: Moldiness.

Online Etymology Dictionary, © 2010 Douglas Harper
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