opacity
gb/oʊpˈæsəti/ us/oʊpˈæsəti/
C1
英語
語義
0件の語義
名詞
C1
property
1
lack of transparency to light
Opacity is how much something blocks light.
用法パターン：
the opacity of [material/object]
よくある間違い：
Learners sometimes confuse opacity (blocks light) with transparency (lets light through).
類義語
opaqueness (More direct and less formal; same meaning.)
|
cloudiness (Often suggests a liquid that is not clear, not any solid object.)
対義語
transparency (The quality of letting light pass through clearly.)
|
clarity (Often used for liquids or images being easy to see through.)
コロケーション
high opacity
|low opacity
|the opacity of glass
|the opacity of water
|reduce opacity
|increase opacity
|light opacity
|optical opacity
|surface opacity
|measure opacity
テーマ
materials
|science
|daily_life
例文
- Frosted glass gets its opacity from the textured surface.
- The lab measured the water’s opacity after the storm.
- As the paint dried, its opacity increased and the wall color stopped showing through.
学習者向け例文
- This glass has high opacity.
- The water has low opacity today.
名詞
technical
C1
quantity
2
degree of being opaque
Opacity can also mean a level, like a number or percent.
用法パターン：
an opacity of [number/percentage]
よくある間違い：
Don’t use *an opacity* to mean simply ‘something is opaque’ unless you are talking about a measurable level.
類義語
density (In everyday talk it can overlap, but density is not the same physical measure.)
対義語
transparency (Can also be measured as a level in similar contexts.)
コロケーション
opacity value
|opacity level
|opacity reading
|opacity measurement
|set the opacity
|adjust the opacity
|opacity percentage
|opacity scale
|opacity threshold
|peak opacity
テーマ
science
|measurement
|materials
例文
- The display lets you set an opacity of 70%.
- The sensor reports opacity readings every minute.
- At higher opacity values, the background becomes harder to see.
学習者向け例文
- Set the opacity to 50%.
- This layer has 80% opacity.
名詞
formal
C1
abstract
3
lack of clarity or openness
Opacity can mean that something is hard to understand because it is not clear or open.
用法パターン：
the opacity of [process/system/statement]
よくある間違い：
Learners may overuse opacity when ‘unclear’ or ‘confusing’ would be more natural in casual speech.
類義語
obscurity (Emphasizes being hard to understand, sometimes due to complexity.)
|
lack of transparency (Focuses on not being open or accountable.)
|
murkiness (More informal; suggests confusion or suspicion.)
対義語
transparency (Openness and clarity about what is happening.)
|
clarity (Ease of understanding and seeing what is meant.)
コロケーション
bureaucratic opacity
|corporate opacity
|government opacity
|opacity of the process
|opacity of the rules
|opacity in decision-making
|regulatory opacity
|legal opacity
|financial opacity
|deliberate opacity
テーマ
communication
|business
|government
例文
- Employees complained about the opacity of the promotion process.
- The report criticized the opacity of the company’s finances.
- The policy’s opacity made it hard for customers to know what they were agreeing to.
学習者向け例文
- The rules have too much opacity.
- We want more transparency and less opacity.
名詞
technical
C2
entity
4
whiteness in medical imaging
In medicine, an opacity is a whiter area on a scan.
用法パターン：
an opacity in [body part/scan]
類義語
shadow (Common non-technical term used by patients; less precise.)
対義語
clear area (Not a standard technical antonym, but the opposite finding on imaging.)
コロケーション
pulmonary opacity
|lung opacity
|focal opacity
|diffuse opacity
|ground-glass opacity
|an opacity on the X-ray
|an opacity in the left lung
|new opacity
|resolving opacity
|persistent opacity
テーマ
health
|medicine
例文
- The radiologist noted a small opacity in the right upper lobe.
- Follow-up imaging showed that the opacity had resolved.
- A new opacity on the chest X-ray prompted further tests.
文法
辞書形
opacity
IPA
GB/oʊpˈæsəti/
US/oʊpˈæsəti/
音節・強勢
opa - city （2音節）
Stress on 2nd syllable (city)
活用形
Noun
- Base: opacity
- Plural: opacities, opacity
関連語
Forms
opacities
noun
Core family
opaque
adjective B2
Related words
opaquely
adverb
opaqueness
noun
Negative and opposite forms
transparent
adjective B2
transparency
noun C1
Advanced or less common
opacify
verb
opacification
noun
表現
ground-glass opacity
1/ɡɹˈaʊnd ɡlˈæs oʊpˈæsəti/
fixed phrase
technical
hazy area on lung scan
A ground-glass opacity is a hazy area on a lung scan.
例文
- The CT report mentioned ground-glass opacity in both lungs.
- Ground-glass opacity can have several possible causes.
- Repeat imaging showed less ground-glass opacity than before.
opacity level
1/oʊpˈæsəti lˈɛvəl/
fixed phrase
technical
amount of opacity
An opacity level is a chosen amount of opacity.
例文
- Lower the opacity level so the text behind it is visible.
- The default opacity level is 100%.
- Try a 30% opacity level for a subtle watermark.
opacity setting
1/oʊpˈæsəti sˈɛtɪŋ/
fixed phrase
technical
control for opacity in software
The opacity setting is where you change transparency.
例文
- Change the opacity setting for the top layer.
- If the highlight is too strong, reduce the opacity setting.
- The app remembers your last opacity setting.
opacity slider
1/oʊpˈæsəti slˈaɪdɚ/
fixed phrase
technical
UI slider for transparency
An opacity slider is a bar you drag to change opacity.
例文
- Drag the opacity slider to the left to make it more transparent.
- The opacity slider is in the Layers panel.
- I can’t find the opacity slider on mobile.