غاف 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.

• غَافٌ

  غَافٌ ذ A species of trees, (AHn, S, O, K,) growing in the sands, and becoming large, the leaves of which are smaller than those of the apple, which it resembles in character, or form, (AHn, O,) having a very sweet fruit…

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