زلخة 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.

• زُلَخَةٌ

  زُلَخَةٌ ذ : see زُلَّخَةٌ, below.…

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• زُلَّخَةٌ

  زُلَّخَةٌ ذ A sloping slide (زُحْلُوفَةٌ, S, K) down which children slide. (S. [In one copy of the S, مِنْهَا الصِّيبَانُ: in two other copies, يَتَزَلَّجُ: and in one of these, عَلَيْهَا is put in the place of مِنْهَا.]…

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