secchi disk: meaning, definition, pronunciation and examples
C1/C2Technical / Scientific
Quick answer
What does “secchi disk” mean?
A circular plate, typically white or with alternating black and white quadrants, lowered into water to measure transparency.
Audio
Pronunciation
Definition
Meaning and Definition
A circular plate, typically white or with alternating black and white quadrants, lowered into water to measure transparency.
A simple limnological and oceanographic tool used to estimate the concentration of suspended particles in water by determining the depth at which the disk is no longer visible.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. The term is used identically in both scientific communities.
Connotations
Purely technical and neutral.
Frequency
Extremely low frequency in general language, but standard within its specific scientific field in both regions.
Grammar
How to Use “secchi disk” in a Sentence
to lower/deploy/use a Secchi disk (in/into a body of water)to take a Secchi disk reading/measurementthe Secchi disk disappeared/was visible to a depth of X metresVocabulary
Collocations
Examples
Examples of “secchi disk” in a Sentence
adjective
British English
- Secchi-disk measurements are a key part of the survey.
American English
- The Secchi-disk data showed a decline in lake clarity.
Usage
Meaning in Context
Business
Not used.
Academic
Used in research papers and textbooks in environmental science, oceanography, limnology, and ecology to describe methodology for assessing water clarity.
Everyday
Virtually never used.
Technical
The primary context. Used in field measurement protocols, environmental monitoring reports, and scientific discussions about water quality parameters.
Vocabulary
Synonyms of “secchi disk”
Neutral
Weak
Watch out
Common Mistakes When Using “secchi disk”
- Incorrect capitalisation (e.g., 'secchi disk')
- Misspelling as 'secci disk' or 'setchi disk'
- Using it as a general term for any water testing device.
FAQ
Frequently Asked Questions
It is named after Pietro Angelo Secchi, a 19th-century Italian astronomer and scientist.
It is designed for use in open, deep waters like lakes, seas, and oceans, not for shallow or very narrow streams.
A shallow depth where the disk disappears indicates high turbidity (low clarity), often due to algae, sediment, or pollution.
Yes. Despite its simplicity, it remains a cost-effective, standardised, and valuable tool for long-term water clarity monitoring programmes worldwide.
A circular plate, typically white or with alternating black and white quadrants, lowered into water to measure transparency.
Secchi disk is usually technical / scientific in register.
Secchi disk: in British English it is pronounced /ˈsɛki dɪsk/, and in American English it is pronounced /ˈsɛki dɪsk/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'SECchi disk checks the SECchi-through depth of water.' It's a disk that lets you see how deep you can see.
Conceptual Metaphor
A RULER FOR VISIBILITY (measuring an intangible property—clarity—with a physical depth).
Practice
Quiz
What is the primary function of a Secchi disk?