methyl methacrylate

noun

: a volatile flammable liquid C5H8O2 that polymerizes readily and is used especially as a monomer for resins

Examples of methyl methacrylate in a Sentence

Recent Examples on the Web
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The tank that overheated starting on May 21 contained 6,000 to 7,000 gallons (22,700 to 26,500 liters) of methyl methacrylate, which is highly flammable. ABC News, 11 June 2026 But the tanks, which contain a highly reactive liquid chemical known as methyl methacrylate, or MMA, used to make materials such as plexiglass, are still at the facility. Hannah Fry, Los Angeles Times, 10 June 2026 The warrant also lists wanted records related to equipment inspections and maintenance at GKN and samples of substances within any tanks or containers suspected of having previously held methyl methacrylate or other hazardous materials. Sean Emery, Oc Register, 10 June 2026 The tank contains methyl methacrylate (MMA), a flammable substance that generates heat spontaneously. Julie Sharp, CBS News, 3 June 2026 Made with oil-absorbing ingredients, including silica and methyl methacrylate cross polymer, the sunscreen also has humectants and emollients. Jenny Berg, InStyle, 29 May 2026 The tank, containing the toxic chemical methyl methacrylate used to make plastics and acrylic paints, threatened to explode as its internal temperature rapidly rose to about 100 degrees Fahrenheit. Zachary Folk, Forbes.com, 27 May 2026 Authorities said roughly 50,000 people were ordered to evacuate in and around the Orange County city after a tank containing highly flammable methyl methacrylate (MMA) overheated and became compromised. Michael Sinkewicz, FOXNews.com, 27 May 2026 The liquid in the 7,000-gallon tank of methyl methacrylate at the Garden Grove facility started to overheat Thursday following an issue with a valve in its refrigeration system, ushering in a tense several days as first responders and experts worked to avoid an explosion. Phil Helsel, NBC news, 26 May 2026

Word History

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of methyl methacrylate was in 1933

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Cite this Entry

“Methyl methacrylate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/methyl%20methacrylate. Accessed 16 Jun. 2026.

Medical Definition

methyl methacrylate

noun
: a volatile flammable liquid ester C5H8O2 that polymerizes readily and is used especially as a monomer for acrylic resin

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