Secchi depth

noun

the depth at which a Secchi disk is no longer visible from the surface of ocean water.

QUIZZES

TAKE ROUND 2 OF OUR PSAT VOCABULARY QUIZ!

Here is our second set of teacher-selected PSAT vocabulary words. Do you know the meanings of these terms?
Question 1 of 10
advocate
to give up possession or occupancy of.
to speak or write in favor of; support or urge by argument; recommend publicly.
to pronounce or decree by judicial sentence.
TAKE THE QUIZ TO FIND OUT
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for secchi depth

Secchi depth
[ sĕk′ē ]

A measure of the clarity of water, especially seawater. Secchi depth is measured using a circular plate, known as a Secchi disk, which is lowered into the water until it is no longer visible. High Secchi depths indicate clear water; whereas low Secchi depths indicate cloudy or turbid water. See also Secchi disk.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.