a substance or preparation for killing algae.

1900–05; alg(ae) + -i- + -cide

algicidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
algicide (ˈældʒɪˌsaɪd)
any substance that kills algae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

algicide al·gi·cide (āl'jĭ-sīd')
A substance that kills or inhibits the growth of algae.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Along with using other chemicals to treat the water an algicide is added.
The primary source of the metal in the sediments is many years of application
  of the algicide, copper sulfate.
Glutaraldehyde is registered as an antimicrobial and as a bactericide, a
  fungicide, and an algicide.
Copper sulfate is used as a fungicide, algicide, and nutritional supplement.
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