Someone who has committed perjury by lying under oath(noun)
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Use "perjurer" in a sentence
"The perjurer is still walking free brazenly mocking us that he will never be prosecuted for his perjury in open court, despite such perjury and vessel circumstances posing an obvious threat to America's National ports security and numerous criminal shipping and other federal law violations."
"Jesuits, and caught too greedily out of their society and communion, that whoso toucheth it with one lip only, and thereafter sweareth falsely, cannot be called a perjurer, since perjury is breaking an oath."
"Who does not call to mind the virtuous indignation with which Mr. Roebuck spoke of this greeting by one he was pleased to call a 'perjurer'?"