Technically, Arabs are classified as "white".
Yes, just look up a dictionary definition of Caucasian:
http://www.bartleby.com/61/1/C0170100.html
ADJECTIVE: 1. Anthropology Of or being a major human racial classification traditionally distinguished by physical characteristics such as very light to brown skin pigmentation and straight to wavy or curly hair, and including peoples indigenous to Europe, northern Africa, western Asia, and India. No longer in scientific use. See Usage Note at race1. 2. Of or relating to the Caucasus region or its peoples, languages, or cultures. 3. Of or relating to a group of three language families spoken in the region of the Caucasus mountains, including Chechen, Abkhaz, and the Kartvelian languages.
NOUN: 1. Anthropology A member of the Caucasian racial classification. Not in scientific use. 2. A native or inhabitant of the Caucasus. 3. The Caucasian language family.
Stereotypically Semitic features are distinctively Caucasian, like bushy eyebrows and "hooked" nose.