a. An evil spirit; a demon.
b. The Devil; Satan.
c. A diabolically evil or wicked person.
2. Informal One who is addicted to something: a dope fiend.
3. Informal One who is completely absorbed in or obsessed with a given job or pastime: a crossword-puzzle fiend.
4. Informal One who is particularly adept at something: a fiend with computers.
v. fiend·ed, fiend·ing, fiends
To crave (a drug, for example): fiended cocaine.
To have an intense desire for something: fiended for the band's new release.
[Middle English, from Old English fēond; see pē(i)- in the Appendix of Indo-European roots.]
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.