US, of a bed : having dimensions of 39 by 75 inches (about 1.0 by 1.9 meters)
also : of a size that fits a twin-size bed
twin-size sheets
compare full-size, king-size, queen-size

Examples of twin-size 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.
However, some models are made to fit a twin-size mattress. Bestreviews, Mercury News, 17 June 2026 As a bonus, this chair doubles as a sleeper—the cushions fold out to create a twin-size bed. Kate McGregor, Architectural Digest, 31 Mar. 2026 Each twin-size mattress has curtains, a light, power outlets, bedding and pillows. Ryan Gillespie, The Orlando Sentinel, 20 Aug. 2025 And, as luck would have it, the 12-inch, twin-size version is what's on major sale for Prime Day. Julia Forbes, Wired News, 9 July 2025 See All Example Sentences for twin-size

Word History

Etymology

twin bed

First Known Use

1926, in the meaning defined above

Time Traveler
The first known use of twin-size was in 1926

Browse Nearby Words

Cite this Entry

“Twin-size.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/twin-size. Accessed 7 Jul. 2026.

Kids Definition

twin-size

adjective
ˈtwin-ˌsīz
: having a size of 39 inches by 75 inches (about 1.0 by 1.9 meters)
a twin-size bed
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