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
Example Sentences
Recent Examples on the Web The bureau advises us to filter our tap water because of carcinogenic chloramines and trihalomethane that are in the water as part of the disinfection process, as well as heavy metals that are picked up in the pipes on the way to homes. 
oregonlive, 25 Apr. 2020 The water was verified to have high levels of TTHM, total trihalomethanes, which can cause multiple medical complications if consumed in large amounts. Detroit Free Press, 20 Apr. 2020 Multiple municipal tests over the years show water in Martin County exceeds the maximum contaminant level for trihalomethane and haloacetic acid, both byproducts of the water’s treatment and both carcinogenic. April Johnston, Cincinnati.com, 26 Dec. 2019 But Veolia has said it was only hired by the city to assess bacteria and harmful chlorine compounds (trihalomethanes) in Flint’s water supply, not lead. Wired, 13 Dec. 2019 In Dos Palos, where the water contains potentially harmful chemicals known as trihalomethanes, Joaquin Garcia has 5-gallon jugs of clean water delivered to his home. Dale Kasler, Phillip Reese And Ryan Sabalow, sacbee, 1 June 2018 And not only lead, but trihalomethane (TTHM) – a chemical byproduct of chlorine disinfectant. Richard Horan, The Christian Science Monitor, 10 July 2018 Until several months ago, customers received notices on the back of their water bills stating that their water had been tested and found to be above federal limits of trihalomethanes and haloacetic acids. Nadia Kounang, CNN, 30 Mar. 2018 The quality of the city’s drinking water has been a hot-button issue since routine testing in Nov. 2016 revealed elevated levels of trihalomethane, a disinfectant by-product. Brian Ballou, Sun-Sentinel.com, 12 Mar. 2018 See More
oregonlive, 25 Apr. 2020 The water was verified to have high levels of TTHM, total trihalomethanes, which can cause multiple medical complications if consumed in large amounts. Detroit Free Press, 20 Apr. 2020 Multiple municipal tests over the years show water in Martin County exceeds the maximum contaminant level for trihalomethane and haloacetic acid, both byproducts of the water’s treatment and both carcinogenic. April Johnston, Cincinnati.com, 26 Dec. 2019 But Veolia has said it was only hired by the city to assess bacteria and harmful chlorine compounds (trihalomethanes) in Flint’s water supply, not lead. Wired, 13 Dec. 2019 In Dos Palos, where the water contains potentially harmful chemicals known as trihalomethanes, Joaquin Garcia has 5-gallon jugs of clean water delivered to his home. Dale Kasler, Phillip Reese And Ryan Sabalow, sacbee, 1 June 2018 And not only lead, but trihalomethane (TTHM) – a chemical byproduct of chlorine disinfectant. Richard Horan, The Christian Science Monitor, 10 July 2018 Until several months ago, customers received notices on the back of their water bills stating that their water had been tested and found to be above federal limits of trihalomethanes and haloacetic acids. Nadia Kounang, CNN, 30 Mar. 2018 The quality of the city’s drinking water has been a hot-button issue since routine testing in Nov. 2016 revealed elevated levels of trihalomethane, a disinfectant by-product. Brian Ballou, Sun-Sentinel.com, 12 Mar. 2018 See More Word History
First Known Use
1968, in the meaning defined above
Medical Definition
trihalomethane
noun
tri·halo·meth·ane
(ˌ)trī-ˌhā-lə-ˈmeth-ˌān, British usually -ˈmē-ˌthān
: any of various derivatives CHX3 of methane (as chloroform) that have three halogen atoms per molecule and are formed especially during the chlorination of drinking water —abbreviation THM