Technically speaking, masa harina means "dough flour" in Spanish, though you'll often see it referred to as corn flour as ...

You can use corn flour in place of regular flour ... Corn flour is also commonly known as masa harina or maize flour, but NOT ...

These homemade tortillas start with a dough made from whole-grain corn masa that is shaped and then cooked like a pancake on a griddle. Homemade salsa makes a great accompaniment. About 1,500 B.C ...

but masa harina is the unexpected star here. It's rather well known as a special kind of finely ground corn flour used to make the dough for recipes like tortillas, pupusas, or tamales ...