bikini; two-piece swimsuit
Refers to the swimwear, especially a two-piece swimsuit. Usually written in katakana.
新しいビキニを買った。
I bought a new bikini.
彼女
She was wearing a bikini at the beach.
She was wearing a red bikini at the beach.
Bikini Island; Bikini
Place-name use referring to Bikini Island; in ordinary writing it often appears as ビキニ島 when the geographical sense needs to be clear.
地図でビキニ島の位置を確認した。
I checked the location of Bikini Island on the map.
彼女はビキニ姿でプールサイドを歩いた。
She walked along the poolside in her bikini.
ワンピース refers to a one-piece swimsuit (or dress), the opposite style to the two-piece ビキニ.
ビキニ refers specifically to a two-piece bikini, whereas 水着 is the general word covering any style of swimwear.
ビキニ is a two-piece swimsuit that still covers the breasts, whereas トップレス specifically means the top is removed or absent.
arrival at ... · counter for suits of clothing · nth place (in a race) · counter for moves (in go)
bikini armor; skimpy armor
bikini model
bikini line
micro-bikini; microkini
Katakana form. No language of origin is specified. The word is conventionally written as ビキニ for both the swimwear and the place name.