Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

Etymologies

After Pietro Angelo Secchi (1818-1878), Italian astronomer hired to test such a disk.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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