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 contained 7,000 gallons of the highly reactive liquid chemical known as methyl methacrylate, or MMA, which can be used to make materials such as Plexiglass. Tony Briscoe, Los Angeles Times, 4 June 2026 The tank contains methyl methacrylate (MMA), a flammable substance that generates heat spontaneously. Julie Sharp, CBS News, 3 June 2026 And, soon, the OCFA crew learns that one of three storage tanks at the plant — one that contains the chemical methyl methacrylate, or MMA — is bulging. Andre Mouchard, Oc Register, 2 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 The crisis at the 7,000-gallon tank of the toxic and flammable chemical methyl methacrylate at GKN Aerospace in Garden Grove, first detected Thursday, had prompted the evacuation of tens of thousands of people. Phil Helsel, NBC news, 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 Over 40,000 people were under evacuation orders for several days after officials reported an alarming situation: A large tank containing nearly 7,000 gallons of methyl methacrylate was at risk of spilling or exploding at GKN Aerospace’s Garden Grove site. Paris Barraza, USA Today, 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 9 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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