n (context|theosophy|Germanic mysticism|nazism) A member of an (alleged) master race comprised of non-Jewish Caucasians, especially those of Nordic or Germanic descent.
n (context|Nazi or white supremacist ideology|informal) A person of Caucasian ethnicity; a white non-Jew.
n (chiefly|US|informal|euphemistic) A Caucasian racist, often one who is an Aryan in the first sense.
n (context|ethnography|obsolete) A subdivision of the Caucasian race, which comprised the Aryans, the Semites, and the Hamites, or the accompanying linguistic subdivision.