benzalkonium chloride

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ben·zal·ko·ni·um chloride

 (bĕn′zăl-kō′nē-əm)
n.
A yellow-white powder prepared in an aqueous solution and used as a detergent, fungicide, bactericide, and spermicide.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.