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Medical Definition of Secci disk
1. A black-and-white disk lowered into the water to measure water transparency, an average is taken of the depth at which the disk disappears when lowered and reappears when raised. (09 Oct 1997)
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1. A black-and-white disk lowered into the water to measure water transparency, an average is taken of the depth at which the disk disappears when lowered and reappears when raised. (09 Oct 1997)