fier·y (fīrē, fīə-rē)
adj. fier·i·er, fier·i·est
a. Consisting of or containing fire.
b. Burning or glowing.
c. Using or effected with fire.
d. Easily ignited; flammable.
2. Having the color of fire; brightly red: fiery hair; a fiery sunset.
a. Torridly hot.
b. Feverishly hot and flushed: fiery cheeks.
c. Being in an inflamed, usually painful condition: a fiery boil.
a. Easily excited or emotionally volatile; tempestuous: a fiery temper.
b. Charged with emotion; spirited: a fiery denunciation.
[Middle English firi, from fir, fire; see FIRE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.