|1.||a person or thing that annoys, esp by imposing itself when it is not wanted; nuisance|
|2.||a. any organism that damages crops, injures or irritates livestock or man, or reduces the fertility of land|
|b. (as modifier): pest control|
|3.||rare an epidemic disease or pestilence|
|[C16: from Latin pestis plague, of obscure origin]|
An injurious plant or animal, especially one harmful to humans.
A deadly epidemic disease; a pestilence.