mould
1 Britishnoun
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a shaped cavity used to give a definite form to fluid or plastic material
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a frame on which something may be constructed
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something shaped in or made on a mould
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shape, form, design, or pattern
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specific nature, character, or type
heroic mould
verb
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to make in a mould
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to shape or form, as by using a mould
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to influence or direct
to mould opinion
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to cling to
the skirt moulds her figure
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metallurgy to make (a material such as sand) into a mould that is used in casting
noun
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a coating or discoloration caused by various saprotrophic fungi that develop in a damp atmosphere on the surface of stored food, fabrics, wallpaper, etc
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any of the fungi that causes this growth
verb
noun
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loose soil, esp when rich in organic matter
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poetic the earth
Other Word Forms
- mouldability noun
- mouldable adjective
Etymology
Origin of mould1
C13 (n): changed from Old French modle, from Latin modulus a small measure, module
Origin of mould2
C15: dialect (Northern English) mowlde mouldy, from the past participle of moulen to become mouldy, probably of Scandinavian origin; compare Old Norse mugla mould
Origin of mould3
Old English molde; related to Old High German molta soil, Gothic mulde
Explanation
Mould is the British spelling for "mold" — the stuff you find growing on old bread or the container you use to create your jello masterpieces. Living mould is like “mildew,” it’s a type of fungus that grows on damp or decaying matter. Mould can also mean a “caste” used to shape a hardening liquid. In this sense mould can refer to both the container and the end product that comes out of the mould. In addition, mould is used as a verb to describe the process of making a mould. When you pour plaster into a mould to make a shape, you mould that shape.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The experts warned that dormant mould spores could reactivate when the overbudget and delayed facilities finally open, posing a health hazard for the lifetime of the buildings.
From BBC • Mar. 19, 2026
NHS Greater Glasgow and Clyde is seeking to rebuild a cancer ward at Scotland's largest hospital after issues with mould and water ingress.
From BBC • Mar. 16, 2026
On Thursday, Gray told the Scottish Parliament that mould had been found in one of the closed rooms in the ward.
From BBC • Mar. 16, 2026
Alexander Fleming discovered penicillin after mould accidentally contaminated a laboratory dish and killed surrounding bacteria.
From Science Daily • Mar. 14, 2026
Hooper began to mould plasticine between his hands, for another layer to the geological model, standing on a board beside the window.
From "I'm the King of the Castle" by Susan Hill
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.