Definition of Secchi disc in English:

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Secchi disc

Pronunciation: /ˈsekē ˌdisk/

noun

An opaque disk, typically white, used to gauge the transparency of water by measuring the depth ( Secchi depth) at which the disk ceases to be visible from the surface.
Example sentences
  • Overall difference between species in use of Secchi depths varied by habitat type.
  • Mean Secchi depths tended to be higher in 1996 than in 1997, but these differences also were not statistically significant.
  • Temperature (in degrees Celsius) was measured at the surface and close to the bottom, and the Secchi depth was determined.

Origin

Early 20th century: named after Angelo Secchi (1818–78), Italian astronomer.

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