There are 2 definitions of bikini in English:

bikini1

Syllabification: bi·ki·ni
Pronunciation: /biˈkēnē
 
/

noun (plural bikinis)

1A very brief two-piece swimsuit for women.
More example sentences
  • It may be winter outside, but Marks & Spencer is hotting up with fantastic bikinis, swimsuits, tankinis and dresses to flatter all.
  • A lot of hardy Scots braved what were chilly conditions and sported swimming costumes and even bikinis.
  • Some of the great sparkling looks came in tiny swimsuits or two-piece bikinis studded with silver nail heads including crocheted white suits.
1.1 (also bikinis) Scanty underpants.
More example sentences
  • Try layering a swim short over a one-piece or opt for low, hipster bikini bottoms.
  • As well as winning the bra, she was photographed wearing both it and a pair of Kylie-esque bikini pants in a national newspaper.
  • Bikinis are a super comfortable medium coverage silhouette that won’t show thru under heavier fabrics like denim or wool.

Origin

1940s: named after Bikini, where an atomic bomb was exploded in 1946 (because of the supposed 'explosive' effect created by the garment).

Definition of bikini in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal

There are 2 definitions of bikini in English:

Bikini2

Syllabification: Bi·ki·ni
Pronunciation: /biˈkēnē
 
/
An atoll in the Marshall Islands, in the western Pacific Ocean, used by the US 1946–58 as a site for testing nuclear weapons.

Definition of bikini in: