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In page Arabs:

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The root ʿ-r-b has several additional meanings in Semitic languages—including "west, sunset," "desert," "mingle," "mixed," "merchant," and "raven"—and are "comprehensible" with all of these having varying degrees of relevance to the emergence of the name. It is also possible that some forms were metathetical from ʿ-B-R "moving around" (Arabic ʿ-B-R "traverse"), and hence, it is alleged, "nomadic."[7]