رثم doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 5 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• رَثَمَ Form 1

  1 رَثَمَ ذ , (T, S, M, K,) aor. رَثِمَ , (M, K,) inf. n. رَثْمٌ, (T, M,) He broke one's nose, (S, M, K,) or his mouth, (T, M, K,) so as to make it bleed, (S,) or so that the blood dropped from it: (M, K:) and رَتَمَ is a…

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• رِثْمٌ

  رِثْمٌ ذ [The antilope leucoryx, or white antelope;] an antelope (ظَبْىٌ) that is purely white; (T, [in which only the pl. is mentioned,] S, M, K;) so accord. to As; (T, S;) and AZ says the like; (T;) inhabiting the sand…

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• رَثْمٌ

  رَثْمٌ ذ : see رَثِيمٌ: and see also a reading of a verse cited in art. رتم, voce رَتْمٌ.…

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• رَثَمٌ

  رَثَمٌ ذ : see 1. -b2- Also, [app. as inf. n. of رَثِمَ, q. v.,] A vehement scratching, and slitting, of the extremity of the nose, so that the blood issues from it and falls in drops. (T.)…

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• رَثِمٌ

  رَثِمٌ ذ : see 1.…

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