An archaic or alternative spelling of the Quran, the central religious text of Islam; also sometimes used to refer to any Islamic religious work.
From Arabic 'al-qur'an' (the recitation), modified through Romance languages. Medieval European texts adopted 'Alcoran' as the standard spelling before modern English standardized 'Quran.'
How a word gets spelled reveals history — 'Alcoran' was how European Christians spelled it when they first encountered Islamic texts, showing how the 'al-' Arabic article got stuck to the beginning in translation.
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