Etymology
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pestilential (adj.)

late 14c., pestilencial, "producing or tending to produce an infectious disease, characterized by the plague," from Medieval Latin pestilentialis, from Latin pestilentia "plague" (see pestilence). Weakened sense of "mischievous, pernicious" is from 1530s. Related: Pestilentially.

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Definitions of pestilential

pestilential (adj.)
likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"- Jonathan Swift;
From wordnet.princeton.edu