mon·o·ki·ni 
(mŏn′ə-kēnē)
(mŏn′ə-kēnē)n. pl. mo·no·ki·nis
1. A women's close-fitting, one-piece swimsuit, leaving the legs and arms bare and often featuring cutouts on the front, back, and sides of the torso.
2. A women's topless swimsuit consisting of a brief, close-fitting bottom.
[French : mono-, mono- + (bi)kini, bikini (taken as a compound of bi-, bi- and -kini, since a bikini has two pieces); see BIKINI.]