Definition of "fiend" in English

noun

1. A devil or demon; a malignant or diabolical being; an evil spirit.

2. A very evil person.

3. (obsolete) An enemy; a foe.

   • We waited for our fiend to arrive.

4. (religious, archaic) The enemy of mankind, specifically, the Devil; Satan.

5. (informal) An addict or fanatic.

   • dope fiend
   • He's been a jazz fiend since his teenage years.

verb

1. (slang, intransitive) To yearn; to be desperate. [(often) with for ‘something, especially drugs’]