The word "masa" means "dough" in English. It refers to a mixture of flour, water, and sometimes other ingredients that is kneaded or rolled out to make bread, pasta, or other types of food.
Aside from these date bars, there are plenty of Tex - Mex dishes in the book that I'm eyeing to use some of the Mexican ingredients that I've got crammed in my cabinets as well, such as green chile rice, west Texas carne asado, and at some point, I'm going to have to finally take the plunge and drum up the precious amount of euros needed for a bag of masa harina in Paris and make my own tortillas (page 359). (davidlebovitz.com)
Say I needed 3 tablespoons of masa harina for a soup. (bojongourmet.com)
(Full disclosure: The pancakes are made with masa flour and the eggs are cooked sous vide for the perfect poach.) (bonappetit.com)