زل 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.

• زَلَلْتَ Form 1

  1 زَلَلْتَ ذ , [third pers. زَلَّ,] aor. تَزِلُّ; (S, K;) and زَلِلْتَ, [third pers. likewise زَلَّ,] aor. تَزَلُّ; (Fr, S, K;) inf. n. زَلِيلٌ, (Lh, S, K,) which is of the former verb, (S,) and زَلٌّ, (Lh, K,) also of t…

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• زُلٌّ

  زُلٌّ ذ Slippery: (S:) a place in which one slips; (K;) and signifies the same; (S, K;) and [likewise, i. e.] a place in which the foot slips. (TA.) You say مَقَامٌ زُلٌّ and , and مَقَامَةٌ زُلٌّ and , [A standing-place…

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