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The definition of pest

3 Definitions of: pest

1. noun, a person or thing that annoys, esp by imposing itself when it is not wanted; nuisance
2. noun, a) any organism that damages crops, injures or irritates livestock or man, or reduces the fertility of land b) (as modifier)
3. noun, an epidemic disease or pestilence
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Synonyms:	plague, scourge, pain (informal), infection, bug, insect, epidemic, blight, bane, pestilence	And more...

From Collins