Part of speech: Noun
someone extremely diligent or skillful
Example: he worked like a demon to finish the job on time; she's a demon at math
Categories: Actor, Doer, Worker
Ogre, Daemon, Fiend, Daimon, Monster
The word "demon" comes from Ancient Greek δαίμων. It started in Medieval Latin dēmōn. Then it appeared in Middle English demon.
daimon – A related word in the same word family.
Each language in this chain added phonetic changes that transformed the original sound.