1. 
   Stressor
   A stressor is a chemical or biological agent, environmental condition, an external stimulus or an event that causes stress to an organism. An event that triggers the stress response may include for example: Stressors have a chemical reaction inside of the body. A harmful stressor is detected by the...
   Found op http://en.wikipedia.org/wiki/Stressor
   
   
2. 
   stressor
   [n] - any agent that causes stress to an organism
   Found op http://www.webdictionary.co.uk/definition.php?query=stressor
   
   
3. 
   stressor
   noun any agent that causes stress to an organism
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=stressor
   
   
4. 
   stressor
   (stres´әr) any factor that disturbs homeostasis, producing stress.
   Found op http://www.encyclo.co.uk/local/21001
   
   
5. 
   Stressor
   any chemical, physical, or biological entity that can induce adverse effects on individuals, populations, communities, or ecosystems (Risk Assessment Forum 1990:1).
   Found op http://www.npwrc.usgs.gov/resource/literatr/avian/glossary.htm
   
   
6. 
   stressor
   1) Agent 2) Any agent that causes stress to an organism 3) Job change or marriage, psychologically speaking 4) Stimulus that causes strain
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/stressor/1
   
   

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