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1. Prohibiting slavery: free-soil states.
a. Opposing the extension of slavery before the US Civil War.
b. Free-Soil Of or being a US political party founded in 1848 to oppose the extension of slavery into US territories and the admission of slave states into the Union.
Free′-Soil′er (-soi′lər) n.
a U.S. territory in which slavery was forbidden before the Civil War.
adj. (sometimes l.c.)
1. opposing the extension of slavery into U.S. territories before the Civil War.
2. pertaining to or characteristic of the Free Soil Party.