غول doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 4 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• غَالَهُ Form 1

  1 غَالَهُ ذ , (S, Mgh, O, Msb, K,) aor. يَغُولُهُ, (Msb, TA,) inf. n. غَوْلٌ, (Mgh, Msb, TA,) He, or it, [accord. to the TA said of a thing,] destroyed him; (Lth, Mgh, Msb, K;) as also : (K:) and (K) it (a thing, S, O) t…

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• غَوْلٌ

  غَوْلٌ ذ Far extent of a desert, or waterless desert; (S, O, TA;) because it destroys him who passes along in it: (S, TA:) or of a land; because it casts away the travellers, or wayfarers, causes them to fall, or drop do…

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• غُولٌ

  غُولٌ ذ A kind of [goblin,] demon, devil, or jinnee, which, the Arabs assert, appears to men in the desert, assuming various forms, causing them to wander from the way, and destroying them; (JM, and TA * on the authority…

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• غُوَّلٌ

  عَيْشٌ غُوَّلٌ ذ : see أَغْوَلُ.…

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