Can The Ingredient “natural Flavor” Be A Chemical?

I try to eat all-natural, organic foods, but i can’t help but wonder if the ingredient “natural flavor” is really natural. My Kashi Autumn Wheat cereal has only three ingredients: organic wheat, organic evaporated cane juice, and natural flavor.
Why are they so ambiguous with their terminology? Are they trying to hide some potentially dangerous chemical food additive by terming it as “natural flavor”????