Share this entry
Secchi disc Syllabification: Sec·chi disc
Pronunciation: /ˈsekē ˌdisk/

Definition of Secchi disc in English:


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.


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

Definition of Secchi disc in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources