The difference between Octoroon and Quadroon
When used as nouns, octoroon means someone having one-eighth black ancestry, whereas quadroon means a person of three-fourths caucasian descent and one fourth african descent.
Quadroon is also adjective with the meaning: having three-fourths caucasian descent and one-fourth african descent.
check bellow for the other definitions of Octoroon and Quadroon
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Octoroon as a noun (dated, offensive):
Someone having one-eighth black ancestry.
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Quadroon as a noun (dated):
A person of three-fourths Caucasian descent and one fourth African descent.
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Quadroon as a noun (Australia, dated):
A person of three-quarters Aboriginal descent and one quarter Caucasian descent; a person of one quarter Aboriginal descent.
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Quadroon as an adjective (dated):
Having three-fourths Caucasian descent and one-fourth African descent.