Adding a glosssary

[Stevej24]

WE are adding a  module to our site that will add a glossary.

It is going to add a link to the glossary where each word is used.

Should we add no follow to those?   Or is there any other implication seo wise using this?

[AlanBleiweiss]

Now more than ever, site owners need to be extremely careful about setting up site glossaries.  The shear volume of internal links can get out of hand fast, and over time, exponentially cause mass internal link confusion from an algorithmic perspective.

While I rarely (almost never) recommend bothering to try and figure out how to maximize the user of nofollow attributes, this is a rare exception, though the key is to also consider blocking the glossary from search engines altogether.

I also highly recommend reading articles Lindsay Wassell has written on robots.txt, rel=canonical, nofollow and related topics.  There's a lot to consider on the best approach and she does a great job of breaking down all the alternatives, along with positive and negative impact considerations with each.