مرذ doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• مُرَذٌّ

  أَرْضٌ مُرَذٌّ عَلَيْهَا ذ (As, A 'Obeyd, S, M, K) and ارض مُرَذَّةٌ (Ks, T, S, M) and , (Th, M, K,) or the second and third of these are not allowable, but only the first is, (As, A 'Obeyd, S, M,) Land upon which has fa…

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• مُرِذٌّ

  مُرِذٌّ ذ A sky (سَمَآءٌ) raining, or letting fall, such rain as is termed رَذَاذ; and so مَرِذَّةٌ. (A, TA.) One says, السَّمَآءُ مُرِذٌّ وَالسَّمَاعُ مُلِذٌّ فَهَلْ أَنْتَ إِلَيْنَا مُغِذٌّ [The sky is raining a fine…

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