The bikini or two piece is a women's swimsuit with two parts, one covering the breasts, the other the groin and, optionally, part or all of the buttocks, leaving an uncovered area between the two. It is often worn in hot weather, while swimming or sunning. A bikini is also often worn as an undergarment to the wetsuit for waterskiing, scuba diving, surfing, and wakeboarding.
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bikini A brief two-piece bathing suit worn by women.