WordReference Random House Learner's Dictionary of American English © 2015
pest /pɛst/USA pronunciation n. [countable]
  1. an annoying or troublesome person, animal, or thing;
    nuisance:The youngster was a pest on the airplane.
  2. Insectsan insect or other small animal that harms or destroys garden plants, trees, etc.

Collins Concise English Dictionary © HarperCollins Publishers::

pest /pɛst/ n
  1. a person or thing that annoys, esp by imposing itself when it is not wanted; nuisance
  2. any organism that damages crops, injures or irritates livestock or man, or reduces the fertility of land
  3. (as modifier): pest control
  4. rare an epidemic disease or pestilence
Etymology: 16th Century: from Latin pestis plague, of obscure origin

'pest' also found in these entries:

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