单词	quaternary ammonium compound
释义	quaternary ammonium compound noun : any of numerous strong bases and their salts derived from ammonium by replacement of the hydrogen atoms with organic radicals and important especially as surface-active agents, disinfectants, and drugs Example Sentences Recent Examples on the Web The Environmental Working Group’s senior research and database analyst Samara Geller told Apartment Therapy that dryer sheets contain a potentially harmful chemical called quaternary ammonium compounds (QACS). Megan Schaltegger, House Beautiful, 30 Apr. 2019 Word History First Known Use circa 1934, in the meaning defined above Medical Definition quaternary ammonium compound noun : any of numerous strong bases and their salts derived from ammonium by replacement of the hydrogen atoms with organic radicals and important especially as surface-active agents, disinfectants, and drugs called also quat, quaternary
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