Arab

adj. of a Semitic people living in the Middle East and northern Africa

n. member of a Semitic people living in the Middle East and northern Africa

The araB gene promoter is a bacterial promoter, activated by e L-arabinose binding.
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An Arab (, arabi) is a member of a complexly defined ethnic group who identifies as such on the basis of one or more of either genealogical, political, or linguistic grounds.The Arabic language and culture began to spread in the Middle East in the 2nd century with genealogically Arab Christians such as the Ghassanids, Lakhmids and Banu Judham. The Arabic language gained importance with rise of Islam in the 7th century AD as the language of the Qur'an, which spread the Arabic language with the early Islamic expansion.
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Arabic, Arabian, of a Semitic people living in the Middle East and northern Africa

(n.)
One of a swarthy race occupying Arabia, and numerous in Syria, Northern Africa, etc.
  

multiplying; sowing sedition; a window; a locust