flat iron

noun

1
: a device used for straightening hair by pressing and pulling sections between two heated metal or ceramic, flat, rectangular plates
2
usually flatiron old-fashioned : iron sense 2a

Examples of flat iron in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
During one of the day’s breaks, Tappin won a gift bag, including a flat iron, after answering a question correctly. Bracey Harris, NBC news, 28 Mar. 2026 My dinner on the first night was another happy surprise — a fairly tender and flavorful flat iron steak. Tribune News Service, San Diego Union-Tribune, 10 Mar. 2026 To get this undone wavy look, curl your choppy layers with a flat iron, instead of a curling wand. Audrey Noble, InStyle, 10 Mar. 2026 The latest plans for Foundry Park, previously the north portion of Lincoln Yards, include two enticing opportunities for new flat iron structures — at the corners of Cortland and Kingsbury streets and Sheffield avenue. Edward Keegan, Chicago Tribune, 22 Feb. 2026 See All Example Sentences for flat iron

Word History

First Known Use

1743, in the meaning defined at sense 2

Time Traveler
The first known use of flat iron was in 1743

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Cite this Entry

“Flat iron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flat%20iron. Accessed 1 Apr. 2026.

Kids Definition

flatiron

noun
flat·​iron -ˌī(-ə)rn How to pronounce flatiron (audio)
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