al·gi·cide

[al-juh-sahyd]
noun
a substance or preparation for killing algae.

Origin:
1900–05; alg(ae) + -i- + -cide

al·gi·cid·al, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
algicide (ˈældʒɪˌsaɪd) [Click for IPA pronunciation guide]
 
n
any substance that kills algae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Algicide is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
American Heritage
Medical Dictionary

algicide al·gi·cide (āl'jĭ-sīd')
n.
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
Copper sulfate is used as a fungicide, algicide, and nutritional supplement.
Along with using other chemicals to treat the water an algicide is added.
Glutaraldehyde is registered as an antimicrobial and as a bactericide, a
  fungicide, and an algicide.
It is also used for the oxidation of reduced iron and manganese and color, and
  as a disinfectant and algicide.
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