Hi livegirl1,
you can’t really check PR for a specific term. If you have a page targeting a specific term you can check that page’s PR, but not for a term.
I use the free vesion of Link Assistant (http://www.link-assistant.com/competitors.html) to check PR. There is a feature to search for sites that already link to you and It pulls the PR and puts everything into an xls file for you.
Cheers
Gary