Real Dictionary

tortilla
variable noun: A tortilla is a piece of thin flat bread that first came from Mexico, and is made from corn and eggs.

tortilla in American English
a thin, flat, round cake of unleavened cornmeal or, often, of flour, baked on a griddle or, originally, a flat stone
noun: a thin, round, unleavened bread prepared from cornmeal or sometimes wheat flour, baked on a flat plate of iron, earthenware, or the like

tortilla in British English
noun: a kind of thin pancake made from corn meal and cooked on a hot griddle until dry