t shirt

n. collarless and pullover knit shirt with short sleeves

A T-shirt (or tee shirt) is a shirt, usually buttonless, collarless, and pocketless, with a round neck and short sleeves, that is pulled on over the head and covers most of a person's torso. The sleeves of the T-shirt extend at least slightly over the shoulder but not completely over the elbow. A shirt that is either longer or shorter than this ceases to be a T-shirt. While the term "long-sleeved T-shirt" is often accepted as a type of shirt, "long-sleeved T-shirts" are technically not T-shirts at all, but have merely been given this name due to their thin fabric and similarity in design to a true T-shirt.
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Noun
1. a close-fitting pullover shirt
(synonym) jersey, tee shirt
(hypernym) shirt
(hyponym) turtleneck, polo-neck

T-shirt, collarless and pullover knit shirt with short sleeves, underwear; (Informal) skivvy

n. T-shirt, collarless and pullover knit shirt with short sleeves