plural bikinis
1
a
: a two-piece bathing suit worn by women that does not cover the midriff see also string bikini, tankini
b
: a short snug swimsuit worn by men
2
: a pair of low-cut briefs (see brief entry 2 sense 4)
Launched in May, the underwear brand for men and women includes bikinis, … G-strings and boxer briefs.Phyllis Furman
… ultra low-rise jeans with a built-in bikini or thong.Sunday Tribune (South Africa)
often used before another noun
Bikini briefs are usually lower than the true waist, often at the hips.Clifford Pugh
bikinied adjective

Did you know?

In July 1946, a US Army–Navy task force detonated two thermonuclear bombs at Bikini, an atoll in the Marshall Islands in the Pacific Ocean, and the event dominated news around the world. A French designer, Jacques Heim, used the occasion to introduce a skimpy two-piece bathing suit dubbed l’atome, “the atom.” Another designer, Louis Réard, followed it up with an even smaller suit for which he registered the name bikini. It was first modeled by dancer Micheline Bernardini at a Paris fashion show on July 5. There is no solid evidence for why he gave this name to the suit, but it has since become an international word.

Examples of bikini in a Sentence

Recent Examples on the Web
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The two stood side-by-side outside the resort’s Coliseum Pool with Haack opting for a pink two-piece bikini with a matching cover-up and a white trucker hat promoting her champagne brand, Clé Cachée. Colson Thayer, PEOPLE, 5 Aug. 2026 There will come a day when Livvy Dunne heads out to the beach in a bikini, hands over her phone or whatever is used to record video then and can't pull it off anymore. Sean Joseph Outkick, FOXNews.com, 5 Aug. 2026 Another was a matching blue and white polka dot bikini with the same design. Meg Walters, InStyle, 3 Aug. 2026 Best known for her quick comedic timing and recent acting credit on HBO’s Hacks, the artist donned two red, white and blue prize ribbons atop a matching bikini top in the music video for her song Prettiest Girl in America. Elizabeth Grace Coyne, Forbes.com, 31 July 2026 See All Example Sentences for bikini

Word History

Etymology

French, from Bikini, atoll of the Marshall Islands

First Known Use

1947, in the meaning defined at sense 1a

Time Traveler
The first known use of bikini was in 1947

Browse Nearby Words

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Cite this Entry

“Bikini.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bikini. Accessed 11 Aug. 2026.

Kids Definition

: a scanty two-piece bathing suit for a girl or woman
Etymology

from French bikini "two-piece bathing suit," from Bikini, atoll in the Marshall Islands

Geographical Definition

Bikini

geographical name

island (atoll) of the Marshall Islands

Note: Bikini was the site of U.S. atomic bomb tests in 1946 and hydrogen bomb tests in 1954 and 1956.

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