an·​ti·​freeze | \ˈan-ti-ˌfrēz \

Definition of antifreeze 

1 : a substance added to a liquid (such as the water in an automobile engine) to lower its freezing point

2 : any of various substances (such as proteins or alcohols) that are found in some living organisms (such as certain fish and insects) and serve to lower the freezing point of body fluids especially by limiting ice crystal growth

Examples of antifreeze in a Sentence

Recent Examples on the Web

Antarctic fish produce antifreeze proteins that prevent their blood from freezing in subzero temperatures. Rachael Bay, CBS News, "Can this bird adapt to a warmer climate? Read the genes to find out," 29 May 2018 Antarctic fish produce antifreeze proteins that prevent their blood from freezing in subzero temperatures. Rachael Bay, Scientific American, "Can Yellow Warblers Adapt to a Warmer Climate?," 29 May 2018 His long-sleeved, button-down white dress shirt — the one that was mandated for male graduates — was covered in antifreeze. Amy B Wang, Washington Post, "A teen nearly missed his graduation because of antifreeze burns. Deputies stepped in to help.," 11 June 2018 Some call the frog urine a type of antifreeze, but study co-author Jon Costanzo, a zoologist at Miami University in Ohio, bristles at that term. Amy Lieu, Fox News, "Wood frogs' winter survival may depend on holding in urine: study," 2 May 2018 The pointless experiment du jour, orchestrated by Tito4re, marries neon green antifreeze with red hot molten copper to mesmerizing effect. Eric Limer, Popular Mechanics, "Molten Copper and Antifreeze Make a Neon Nightmare Stew," 30 Dec. 2015 NW Metals also allowed used oil to mix with antifreeze, the environmental quality department announced Thursday. Everton Bailey Jr.,, "DEQ cites Portland scrap yard where 5-alarm fire broke out," 29 Mar. 2018 Radiator fluid, also known as coolant or antifreeze, works to extract heat from the engine and dissipate it through the radiator. Alex Leanse, Popular Mechanics, "How to Get Your Car Ready For Your Next Road Trip," 25 Apr. 2017 His death was ruled a suicide by drinking antifreeze, WTKR reported. Joe Marusak, charlotteobserver, "Her husband died. Then her boyfriend died. Now she's charged with having ricin. | Charlotte Observer," 30 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'antifreeze.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of antifreeze

1903, in the meaning defined at sense 1

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The first known use of antifreeze was in 1903

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English Language Learners Definition of antifreeze

: a substance that is added to the water in a vehicle's engine to prevent it from freezing


an·​ti·​freeze | \ˈan-ti-ˌfrēz \

Kids Definition of antifreeze

: a substance added to the water in an automobile radiator to prevent its freezing

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Comments on antifreeze

What made you want to look up antifreeze? Please tell us where you read or heard it (including the quote, if possible).


obstinately defiant of authority

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