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.
The hair stylist could no longer use a flat iron on my hair because steam was fizzing off the iron. Harriette Cole, Flow Space, 3 June 2025 To seal in the treatment, flat iron each section—passing over strands two to four times. Conçetta Ciarlo, Vogue, 18 Apr. 2025 The flat iron is two inches wide and features a floating plate, so every inch of your hair is flattened and silky. Lauryn Jiles, Miami Herald, 3 Mar. 2025 The plates on the flat iron that press frizz out of my hair no longer lie flat; the motor on my black household fan, which shuts off after a few minutes; the iPhone whose battery depletes itself in an instant. Lenora Chu, The Christian Science Monitor, 20 Dec. 2024 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

Browse Nearby Words

Cite this Entry

“Flat iron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flat%20iron. Accessed 9 Jun. 2025.

Kids Definition

flatiron

noun
flat·​iron -ˌī(-ə)rn How to pronounce flatiron (audio)
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!