What does cornstarch mean in cooking?

cornstarch means: This flour is made of ground corn endosperm. It’s very dense and fine in texture. (in Cooking Dictionary)

What else does cornstarch mean?

• This thickening agent is a white powdery substance that can be used to make sauces, gravies, and puddings. A tablespoon of thickening agent is equivalent to 2 tablespoons flour. It makes clearer sauces. (in Cooking Dictionary)
• Starch made from corn grains and used in industry as well as for thickening during cooking. (in Merlin Dictionary)