Sentence:  …Pa said he guessed he hadn't got much appetite, and he would just drink a cup of coffee and eat a <WSD>donut.</WSD> 
Meaning of the word marked with <WSD> tags:  A deep-fried piece of dough or batter, commonly made in a toroidal or ellipsoidal shape, and mixed with various sweeteners and flavors, sometimes filled with jelly, custard or cream.