1. An evil supernatural being; a devil.
2. A persistently tormenting person, force, or passion: the demon of drug addiction.
3. One who is extremely zealous, skillful, or diligent: worked away like a demon; a real demon at math.
4. Variant of daimon.
[Middle English, from Late Latin daemōn, from Latin, spirit, from Greek daimōn, divine power; see dā- in the Appendix of Indo-European roots.]
de·monic (-mŏnĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.