Pronunciation: (fīur'ē, fī'u-rē),[key] —adj.,fier•i•er, fier•i•est. 1. consisting of, attended with, characterized by, or containing fire: a volcano's fiery discharge. 2. intensely hot: fiery desert sands. 3. like or suggestive of fire: a fiery red; angry, fiery eyes. 4. intensely ardent, impetuous, or passionate: fiery courage; a fiery speech. 5. easily angered or provoked: a fiery temper. 6. causing a burning sensation, as certain liquors or condiments.
7. inflamed, as a tumor or sore.
8. Mining Older Use. a. highly flammable.
b. containing highly flammable gas.