لوثا doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• لَوْثًا

  حَلَّ مِنْ عِمَامَتِهِ لَوْثًا أَوْ لَوْثَيْنِ ذ He loosed, or undid, a turn, or twist, or two turns, or twists, of his turban. (TA, from a trad.) -A2- لَوْثٌ Strength; power; vigour: (S, K, TA:) as also , [as in one pla…

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