green mould: meaning, definition, pronunciation and examples
C1neutral to informal; technical in biological contexts.
Quick answer
What does “green mould” mean?
A fungal growth that appears as a green, fuzzy or powdery coating, typically on organic matter like food, leather, or damp surfaces.
Audio
Pronunciation
Definition
Meaning and Definition
A fungal growth that appears as a green, fuzzy or powdery coating, typically on organic matter like food, leather, or damp surfaces.
A term sometimes used metaphorically to describe decay, neglect, or something that has been left untouched for too long. Can also refer to specific fungal species like Penicillium.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'mould' (UK) vs. 'mold' (US). The phrase is structurally identical. 'Green mold' is the American spelling.
Connotations
Identical in both varieties: negative, associated with decay, spoilage, and unclean conditions.
Frequency
Slightly higher frequency in UK English, as 'mould' is the standard spelling. In the US, 'mold' is standard, and the phrase is equally understood.
Grammar
How to Use “green mould” in a Sentence
[surface] is covered with green mouldGreen mould has formed on [object]to remove/clean green mould from [surface]Vocabulary
Collocations
Examples
Examples of “green mould” in a Sentence
verb
British English
- The cheese began to green-mould in the humid pantry.
American English
- The bread started to green-mold after a week.
adjective
British English
- The green-mould problem in the flat was severe.
American English
- They had a green-mold infestation in the crawl space.
Usage
Meaning in Context
Business
Rare. Might appear in property management regarding damp issues: 'The basement walls showed signs of green mould.'
Academic
Used in biology, mycology, food science, and environmental studies to describe specific fungal contamination.
Everyday
Common when discussing spoiled food or damp problems in homes: 'I had to throw the jam away because of green mould.'
Technical
Refers to specific genera of fungi (e.g., Penicillium, Aspergillus) causing spoilage or used in production (e.g., penicillin).
Watch out
Common Mistakes When Using “green mould”
- Misspelling 'mould' as 'mold' in UK contexts and vice versa. Using it as a verb (it's a noun phrase).
FAQ
Frequently Asked Questions
Not always. While it indicates spoilage on food and can cause allergies, some green moulds like Penicillium are used to produce antibiotics and cheeses (e.g., blue cheese).
Mildew is a specific type of mould, often flat and growing on surfaces like plants or shower walls. 'Green mould' typically refers to fuzzy, raised growths, commonly on food. In everyday use, the terms are sometimes conflated.
Use it as a compound noun, often with prepositions like 'on', 'with', or 'covered in'. Example: 'The damp wall was covered with green mould.'
Standard dictionaries do not list it as a verb. The noun 'mould/mold' can be used as a verb (e.g., 'The bread molded'), but 'green-mould' as a verb is non-standard, though occasionally used creatively.
A fungal growth that appears as a green, fuzzy or powdery coating, typically on organic matter like food, leather, or damp surfaces.
Green mould is usually neutral to informal; technical in biological contexts. in register.
Green mould: in British English it is pronounced /ˌɡriːn ˈməʊld/, and in American English it is pronounced /ˌɡriːn ˈmoʊld/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “Gathering mould/mold (figurative: becoming stale or outdated).”
Learning
Memory Aids
Mnemonic
Think of an old, forgotten GREEN apple left in a MOULDy cellar.
Conceptual Metaphor
GREEN MOULD IS NEGLECT / DECAY (e.g., 'His old plans were gathering green mould.')
Practice
Quiz
In which context is 'green mould' most likely used metaphorically?