octoroon (n.)youdaoicibaDictYouDict[octoroon 词源字典]
1861, irregular formation from Latin octo "eight" (see eight) + suffix abstracted from quadroon (in which the suffix actually is -oon). Offspring of a quadroon and a white; so called for having one-eighth Negro blood.[octoroon etymology, octoroon origin, 英语词源]