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Definition of Fiend
1. Noun. A cruel wicked and inhuman person.
Generic synonyms: Disagreeable Person, Unpleasant Person
Specialized synonyms: Demoniac
Derivative terms: Demonic, Demonize, Devilize, Diabolic, Diabolic, Monstrous
2. Noun. An evil supernatural being.
Generic synonyms: Evil Spirit
Specialized synonyms: Incubus, Succuba, Succubus, Dibbuk, Dybbuk
Derivative terms: Demonize, Devilize
3. Noun. A person motivated by irrational enthusiasm (as for a cause). "A fanatic is one who can't change his mind and won't change the subject"
Generic synonyms: Enthusiast, Partisan, Partizan
Derivative terms: Fanatic, Fanatical
Definition of Fiend
1. n. An implacable or malicious foe; one who is diabolically wicked or cruel; an infernal being; -- applied specifically to the devil or a demon.
Definition of Fiend
1. Noun. A demon ¹
2. Noun. A very evil person ¹
3. Noun. (informal) An addict ¹
¹ Source: wiktionary.com
Definition of Fiend
1. a demon [n -S] - See also: demon
Medical Definition of Fiend
1. An implacable or malicious foe; one who is diabolically wicked or cruel; an infernal being; applied specifically to the devil or a demon. "Into this wild abyss the wary fiend Stood on the brink of Hell and looked a while." (Milton) "O woman! woman! when to ill thy mind Is bent, all hell contains no fouler fiend." (Pope) Origin: OE. Fend, find, fiend, feond, fiend, foe, AS. Feond; akin to OS. Fiond, D. Vijand enemy, OHG. Fiant, G. Feind, Icel. Fjand, Sw. & Dan. Fiende, Goth. Fijands; orig. P.pr. Of a verb meaning to hate, AS. Feon, feogan, OHG. Fin, Goth. Fijan, Skr. Piy to scorn; prob. Akin to E. Feud a quarrel. 81. Cf. Foe, Friend. Source: Websters Dictionary (01 Mar 1998)