غبوق 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.

• غَبُوقٌ

  غَبُوقٌ ذ An evening-draught; i. e. a draught, drink, or potation, [and particularly of milk, but also applied to one of water, and of wine, &c.,] that is drunk in the evening, or the last, or latter, part of the day. (S…

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