shirtwaist Syllabification: (shirt·waist)Pronunciation: /ˈSHərtˌwāst/Definition of shirtwaist noun North American a woman’s blouse that resembles a shirt. (also shirtwaist dress or shirtwaister) a woman’s dress with a seam at the waist, its bodice incorporating a collar and buttons in the style of a shirt. shirtwaist in other Oxford dictionaries Definition of shirtwaist in the British & World English dictionary