A peculiarity, as in pronunciation, grammar, or choice and use of words, of English as spoken by negroes, especially in the southern United States.(noun)
The Century Dictionary (Public Domain)
Use "negroism" in a sentence
"Anti-semitism and anti-negroism will grow unless heroic measures can be undertaken to stop them."
"Indeed, the right is defined by its relationship to the boogeyman, whether communism or terrorism or some other kind of ism negroism? immigrantism?"
"With our only cause of ignorance and poverty among the people, and only element of discord among the States, extirpated by the gradual removal of slavery and negroism, we would bound forward in a new and wonderful career of power and prosperity."