A variant spelling or transliteration of Qur'an, the Islamic holy text, sometimes used in older English texts or specific regional contexts.
From Arabic 'al-Qur'ān' (the recitation), this is an alternate Anglicization that emphasizes the gur- pronunciation found in some transliteration systems, though 'Qur'an' and 'Koran' are now standard.
The existence of multiple English spellings for this word (Quran, Koran, Guran) shows how transliteration—converting one alphabet to another—isn't a perfect science, and different eras and regions settled on different versions.
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