pestilential adj : likely to spread and cause an epidemic disease; "a pestilential malignancy in the air"- Jonathan Swift; "plaguey fevers" [syn: pestilent, pestiferous, plaguey]
A pestilence is any virulent and highly infectious disease that can cause an epidemic or even a pandemic. The word can also be used about parasites causing large scale sickness and death, such as Guinea worm.
Originally the word referred to the bubonic plague, which is called pestis in Latin.
It can also refer to:
pestilential in Simple English: Pestilence