Definition of «singlet»

A singlet is a type of sleeveless undershirt that covers the torso. It is usually worn as an undergarment or for athletic activities.

By modeling the reaction, they concluded that the initial energy burst could come from ultraviolet (UV) light, which produces energetic oxygen called singlet oxygen when it breaks up water molecules. (sciencemag.org)
Plus, men in singlets! (sbnation.com)
There were 3/4 pants with singlet tops. (housegoeshome.com)
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