how to block specific friends from appearing on your friend list on facebook?

[techchick]

How do I change who can see the people I'm friends with?
Go to your profile and click Edit in the top right corner
From the menu in the left column, click Friends and Relationships
Go to the Friends section and use the audience selector on the right side to control who can see your friends
You can also organize friends into smaller lists for your own use. These lists are not shown on your profile.

If you've upgraded to timeline, the new profile then..

Who can see the Friends section of my timeline?
By default, everyone can see who your friends are in the Friends section of your timeline. To change this setting:
Go to your timeline
Click on the Friends unit, beneath your cover
Click on the Edit button at the top of the page and use the audience selector to choose who can see your friends
You can also organize friends into smaller lists for your own use. These lists are not shown on your profile.