One who controls the action of a slave owned by others.(noun)
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Use "slavemaster" in a sentence
"Is that not the same institution whose proudly-used nickname is based on what slaves used to call the slavemaster's wife?"
"Another replica-for dealt with the problem by reprogramming other replicators to bring their extracted ores to it; they dubbed that one the "slavemaster," and discovered that the slavemaster had organized a defense against the cannibals, built around using the slaves in teams."
"THE ROBOTS, you should welcome them now as your slavemaster"