طخيآء doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• طَخْيَآءُ

  طَخْيَآءُ ذ The darkness of clouds. (Lth, Mgh, TA.) -b2- And لَيْلَةٌ طَخْيَآءُ (S, * ISd, Mgh, K *) A dark night; (S, K;) as also لَيْلَةٌ : (TA:) or a night intensely dark, (ISd, Mgh, TA,) in which the clouds have co…

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