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Longman Dictionary of Contemporary English
mass murderer
noun
EXAMPLES FROM CORPUS
▪ Burt an the Yurt-man, a mass murderer and chicken-farm burner.
▪ But at this moment Kate could not have cared less if he was a mass murderer.
▪ That year, Esquire magazine sent contributing editor Philip Caputo to Stockton to discover what might have motivated the mass murderer.
▪ The art of a mass murderer.
Wiktionary
mass murderer

n. Someone who commits a mass murder.

WordNet
mass murderer

n. a person who is responsible for the deaths of many victims in a single incident

Usage examples of "mass murderer".

An attractive female journalist named Sandy Fawkes met Knowles in Atlanta, and spent several days with him without suspecting that he was a mass murderer.

In this world, you got a two-hundred-year-old mass murderer spouting orders at you before your eyes were all the way open.

They start to open up about each other -- but Zeth reveals a little too much, and Fen realizes to her horror that Zeth is really Kyp Durron - the most infamous mass murderer since Palpatine.

Of course, the siege of Leningrad was one of the great battles, one of the turning points in human history, the army of one mass murderer throwing back the army of a fellow mass murderer.