Secchi disc

noun
Sec·chi disc | \ ˈsekē- \

Definition of Secchi disc 

: a reflective disc lowered into a body of water to permit measurement of the relative transparency of the water by recording the depth at which the disc is no longer visible

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History and Etymology for Secchi disc

after Angelo Secchi †1878 Italian astronomer

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Dictionary Entries near Secchi disc

secant

sec art

secateur

Secchi disc

secco

Seccotine

secede

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