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fish ladder

noun
1.
a series of ascending pools constructed to enable salmon or other fish to swim upstream around or over a dam.
Origin
1860-1865
1860-65, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for fish-ladder

fish ladder

noun
1.
a row of ascending pools or weirs connected by short falls to allow fish to pass barrages or dams
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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10
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