Longman Dictionary of Contemporary English homepage

bioindicator

 noun
     
bi‧o‧in‧di‧ca‧tor [countable] technical
a small number of animals, plants, insects etc that are typical of all the animals, plants etc normally found in a particular area, which scientists study in order to get information about the whole area:
This insect-bacteria bioindicator is a reliable tool for assessing environmental damage to the country's wetlands.
Definition from the Longman Dictionary of Contemporary English
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