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Secchi disk

   Also found in: Wikipedia 0.10 sec.
Secchi disk
n.
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.
[After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk.]
Secchi disk
An instrument used for measuring the clarity of water, especially seawater. It consists of a circular plate divided into alternating black and white quadrants and attached to a long measuring tape. The plate is lowered into the water, and the depth at which it is no longer visible from the surface is recorded. The Secchi disk is named after its inventor, Italian astronomer Angelo Secchi (1818-1878). See also Secchi depth.


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