See Also: Secchi disc(dictionary)
Disc(medicine)
DISC(money)
disc gel(medicine)
Disc(health)
tax disc(dictionary)
disc(1)(dictionary)
disc(2)(dictionary)
Z disc(medicine)
disc(dictionary)

Secchi disc (iou)



Secchi disc noun phr. , *Secchi disk, Secchi's disk. E20.
[Angelo Secchi (1818-78), Italian astronomer.]
An opaque white disc used to gauge the transparency of water by measuring the depth at which the disc ceases to be visible from the surface.