| 单词 | secchi disk |
| 释义 | Secchi disknounan opaque, white or black-and-white disk used to measure the cloudiness or turbidity of ocean water by the point at which it is no longer visible from the surface. Origin of Secchi diskFirst recorded in 1910–15; named after Pietro Angelo Secchi (1818–78), Italian astronomer who invented it in 1865 Words nearby Secchi disksecant, secateurs, Secaucus, Secchi, Secchi depth, Secchi disk, secco, secede, secern, Secernentasida, secession Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for Secchi diskSecchi disk An instrument used for measuring the clarity of water, especially seawater. It consists of a circular plate divided into alternating black and white quadrants and attached to a long measuring tape. The plate is lowered into the water, and the depth at which it is no longer visible from the surface is recorded. The Secchi disk is named after its inventor, Italian astronomer Angelo Secchi (1818-1878). See also Secchi depth. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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