T-shirt Syllabification: (T-shirt) (also tee shirt)Translate T-shirt | into French | into German | into Italian | into Spanish Definition of T-shirt noun a short-sleeved casual top, generally made of cotton, having the shape of a T when spread out flat. T-shirt can also be spelled tee shirt: both are correct.T-shirt in other Oxford dictionaries Definition of T-shirt in the British & World English dictionary