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Explanation: I assume you want the word written in Arabic script, since you already know how the word is pronounced, and you know its meaning (sort of).
Hummus is not just the concoction, but the garbanzos (chick peas) themselves. The dish you are referring to is called HUMMUS BITTAHEENA, typically styled HUMMUS BITAHINI on some canned products and restaurant menus, in imitation of East Mediterranean pronunciation.