- The definition of a stressor is something that causes tension or anxiety.
An example of a stressor is a huge project due in a short amount of time.
any stimulus producing mental or physical stress in an organism
An agent, condition, or other stimulus that causes stress to an organism.
- (psychology, biology) An environmental condition or influence that stresses (i.e. causes stress f) an organism.
From stress +â€Ž -or.