Bactericide is a 11 letter English word. It's valid Words with friends word worth 21 points.
You can make 571 anagrams from letters in bactericide (abccdeeiirt).
First recorded in 1880-85; bacteri- + -cide
Sure, water filter makers put a bit of bactericide in their products to tamp down the infestation.
Ink as a bactericide is less known, but worth consideration.
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