古英語のspell, story, narrative, fableから。原語ゲルマン語*spellam, to say, to tell, PIE*spel, to say, to read, to chant, to reciteから。語源はcharm(魅力)、spell(呪文)、magic(魔法)など。古フランス語の同音異義語espelir「綴る、呪文、発音する」に由来する語源。
The term 'spell' is generally used for magical procedures which cause harm, or force people to do something against their will -- unlike charms for healing, protection, etc. ["Oxford Dictionary of English Folklore"]Also in Old English, "doctrine; a sermon; religious instruction or teaching; the gospel; a book of the Bible;" compare gospel.