You Pronounce It: [puh-rif-uh-ree]
Definition: noun, plural peripheries.
1. the external boundary of any surface or area.
2. the external surface of a body.
3. the edge or outskirts, as of a city or urban area.
4. the relatively minor, irrelevant, or superficial aspects of the subject in question:
The preliminary research did not, of course, take me beyond the periphery of my problem.
5. Anatomy. the area in which nerves end.
I found it:
While reading something for my rhetoric course.