Etymology and spelling
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"Hummus" comes from the Arabic word meaning "chickpeas", and the complete name of the prepared spread in Arabic is ḥummuṣ bi ṭaḥīna which means "chickpeas with tahini".
Spelling of the word in English can be inconsistent. "Hummus" is the most common spelling in both American and British English. The spelling "houmous" is however common enough in British English to be also listed as a less common spelling in some UK dictionaries but not, for example, in the Cambridge online dictionary. Some US dictionaries also list other spellings such as humus, hommus, and hommos, but not Merriam-Webster, for example.