trihalomethane
noun
tri·halo·meth·ane
(ˌ)trī-ˌha-lə-ˈme-ˌthān
British usually -ˈmē-
: any of various derivatives CHX3 of methane (such as chloroform) that have three halogen atoms per molecule and are formed especially during the chlorination of drinking water
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Merriam-Webster unabridged
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