ظلالة 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.

• ظَلَالَةٌ

  ظَلَالَةٌ ذ , (M, TA,) with fet-h, (TA,) the subst. from the verb in the phrase ظَلَّلْنَا عَلَيْهِمُ الغَمَامَ [expl. above, see 2; as such app. meaning either The making to give shade, like the inf. n. تَظْلِيلٌ, or a …

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• ظِلَالَةٌ

  ظِلَالَةٌ ذ : see ظُلَّةٌ. -b2- Also A cloud that one sees by itself, and of which one sees the shadow upon the earth. (K.) -b3- And one says, رَأَيْتُ ظِلَالَةً مِنَ الطَّيْرِ i. e. غَيَابَةً [app. meaning I saw a cover…

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