Definitions of blogroll on the Web:

• This is a list of blogging terms. Blogging, like any hobby, has developed something of a specialised vocabulary. ...
  en.wikipedia.org/wiki/Blogroll

• A blogger's list of hyperlinks to other blogs
  en.wiktionary.org/wiki/blogroll

• A list of blogs, usually placed in the sidebar of a blog, that reads as a list of recommendations by the blogger of other blogs.
  blogmeister.pbwiki.com/Blog+Vocabulary

• A compilation of links to recommended blogs.
  journalism.nyu.edu/pubzone/wewantmedia/node/207

• A list of links on the blog, which is usually of other blog sites of the same company or related companies.
  www.promotefirst.com/resources/seo-glossary/

• A once very popular feature on blogs that allowed the author to share with his readers a list of recommended external blogs. ...
  aris-haryana.blogspot.com/2008/11/bloggers-glossary-part-1.html