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.
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 Sleep in Heavenly Peace received $7,500 to provide twin-size beds to children in need ages 3-17 who otherwise might sleep on the floor. Linda McIntosh, San Diego Union-Tribune, 19 June 2025 For smaller beds, grab a twin-size for $28 on sale. Mariana Best, Better Homes & Gardens, 15 June 2025 The hotel is fully accessible and has 14 accessible rooms (including twin-size beds and queen-size bed options) that offer roll-in and transfer showers, visual alarms, and closed captions on TVs. Stacey Leasca, Travel + Leisure, 28 May 2025 Use it as a twin-size bed or two, sofa, or pop the trundle bed to create a king-size bed in a guest room. Blake Bakkila, Architectural Digest, 21 Apr. 2025 The glamping site offers heated mattresses on the king, queen, or twin-size beds, woodstoves or space heaters indoors, covered patio spaces, firewood delivered each night, and a store stocked with hot chocolate and other goodies. Jim Dobson, Forbes.com, 9 Apr. 2025 The twin-size Premier Hybrid is the only size currently $100 less, but the queen starts at a respectable $999, while the king starts at $1,199. Christopher Murray, FOXNews.com, 4 Apr. 2025 This twin-size comes with a hands-free electric pump, simply twist it and watch the air mattress inflate. Rylee Johnston, Travel + Leisure, 19 Mar. 2025

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 25 Jul. 2025.

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
Last Updated: - Updated example sentences
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