D defs.my
Entry 2 senses Webster, 1913

Satanism

/sāt'-ən-ĭzˌ-əm/ · Sa·tan·ism · IPA /ˈseɪtənɪzm/
01 n. The evil and malicious disposition of Satan; a diabolical spirit.
  1. 1.
    The evil and malicious disposition of Satan; a diabolical spirit.[R.]
  2. 2.
    The worship of Satan.