Entries on ثأل in 11 Arabic dictionaries by the authors Abū Mūsā al-Madīnī, al-Majmūʿ al-Mughīth fī Gharībay al-Qurʾān wa-l-Ḥadīth, Ismāʿīl bin Ḥammād al-Jawharī, Tāj al-Lugha wa Ṣiḥāḥ al-ʿArabīya, Arabic-English Lexicon by Edward William Lane, and 8 more
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[ثأل] الثوءلول: واحد الثآليل.