The word demon is not found
in Scripture, but it means evil spirit or devil. The word devil is used of Satan, the prince
of demons (Mt. 9:34; 12:24). He is the chief devil and the original source of evil in the
universe. The Gr. word for devil used in connection with Satan is diabolos, meaning
adversary, false accuser, slanderer, devil. It is used of men and translated false accuser
and slanderer in 1 Tim. 3:11; 2 Tim. 3:3; Tit. 2:3. It is translated devil once as applying to
Judas when he became an adversary of Christ (Jn. 6:70). In 34 other places it is
translated devil and used of Satan as the chief adversary of God.
In the other 77 places where the words devil and devils are found, they refer to evil
spirits or demons and are derived from the Gr. words daimonion and daimon,
meaning evil spirits or devils, and daimonizomai, to have or be possessed by a devil.
There is only one prince of devils but many demons. He has an angelic body and cannot
enter bodily into anyone (see note n, Lk. 22:3); but demons are disembodied spirits and
do not seem to be able to operate in the material world except through possession of the
bodies of men or beasts.