Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A disk, divided into black and white quarters, used to gauge water clarity by measuring the depth at which it is no longer visible from the surface.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
circular disk used to measurewater transparency (and thusturbidity )
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[After Pietro Angelo Secchi, (1818–1878), Italian astronomer hired to test such a disk.]
from Wiktionary, Creative Commons Attribution/Share-Alike License
Secchi + disk
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Examples
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