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

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.

Examples

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