A woman's one-piece beach garment equivalent to the lower half of a bikini.
- ‘Thongs, monokinis, bikinis, trikinis, pubikinis, tankinis are the revealing ‘ins’ for the first summer of the millennium.’
- ‘In the same year, the arrival of the synthetic fibre Lycra paved the way for a more radical look, with fashion designer Rudi Gernreich creating the monokini.’
- ‘In 1964 the bikini made its first appearance on the cover of Sports Illustrated; that same year, the mod designer took the two-piece concept one step further with his topless monokini.’
- ‘These days we have bikinis, monokinis, and thongs, which should be reserved for the very young, and the very fit.’
1960s: from mono- one + a shortened form of bikini (the first syllable misinterpreted as bi- two).