خون 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.

• خَانَهُ Form 1

  1 خَانَهُ خان خانه خانة , (S, K,) aor. يَخُونُهُ, (S,) inf. n. خِيَانَةٌ and خَوْنٌ and مَخَانَةٌ (S, K) and خَانَةٌ (K) and خَائِنَةٌ, of the measure فَاعِلَةٌ, like لَاغِيَةٌ &c.; (TA;) and ; (S, K;) He was unfaithful,…

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• خَوْنٌ

  خَوْنٌ خون خونن an inf. n. of 1. (S, Msb, K.) -b2- And [hence,] (tropical:) Weakness. (JK, K, TA.) One says فِى ظَهْرِهِ خَوْنٌ (tropical:) In his back is weakness. (JK, TA.) -b3- And (assumed tropical:) Languidness in t…

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