racist:
1932 as a noun, 1938 as an adjective, from race (n.2); racism is first attested 1936 (from Fr. racisme, 1935), originally in the context of Nazi theories. But they replaced earlier words, racialism (1907) and racialist (1917), both often used at first in a British or South African context.
Online Etymology Dictionary, © 2001 Douglas Harper
http://www.etymonline.com/index.php?term=racist
No primary sources listed, sadly.