from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A measure of the cloudiness or turbidity of surface water.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A measure of the turbidity of a body of water; the depth at which a Secchi disk is no longer visible.
After the Secchi disk.(American Heritage® Dictionary of the English Language, Fourth Edition)
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