from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Advocating the practice of slavery.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Supporting slavery.
from the GNU version of the Collaborative International Dictionary of English
- adj. Favoring slavery.
from The Century Dictionary and Cyclopedia
- In United States history, favoring the principles and continuance of the institution of slavery, or opposed to national interference there-with: as, a pro-slavery Whig; pro-slavery resolutions.
pro- + slavery (Wiktionary)