عثم doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• عَثَمَ Form 1

  1 عَثَمَ ذ , said of a broken bone, (S, K,) or it is peculiarly said of the arm, (K, [i. e. one says عَثَمَتِ اليَدُ,]) aor. عَثِمَ , (PS,) inf. n. عَثْمٌ, (TA,) It became set unevenly, (S, K, TA,) i. e. [forming a node,…

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• عَثْمٌ

  عَثْمٌ ذ inf. n. of 1 [q. v.]. (TA.) -b2- جُبِرَتْ يَدُهُ عَلَى عَثْمٍ means عَلَى عُقْدَةٍ, (S and O in art. عقد,) [i. e. His arm was set and joined unevenly,] so as to form a node, or protuberance, like a swelling, not…

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• عَثِمٌ

  عَثِمٌ ذ , applied to a [broken] bone, Badly set, so as to have an unevenness remaining in it. (TA.) [And signifies the same, applied to an arm (يَدٌ); expl. by Golius as applied to a hand, and meaning Distortedly consol…

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