Definition of Secchi disc in English:

Secchi disc

Syllabification: Sec·chi 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.
    More 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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