We found one dictionary that defines the word slavemistress:

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1. slavemistress: Wiktionary

Definitions from Wiktionary (slavemistress) ▸ noun:  A woman who owns a slave. ▸ Words similar to slavemistress ▸ Usage examples for slavemistress ▸ Idioms related to slavemistress ▸ Wikipedia articles (New!) ▸ Popular adjectives describing slavemistress ▸ Words that often appear near slavemistress ▸ Rhymes of slavemistress ▸ Invented words related to slavemistress