Board Thread:General Discussion/@comment-27794354-20160701120438

Many wikis adopt the Pedia suffix, marrying the wiki topic with it using either A or O, but there is some indecision on the correct use as I've seen several wikis using either.

I've always known O-Pedia to be the correct use, as I remember from school that encyclopedia means general education in a branch of ancient greek, so you would think opedia was simply lifted and applied, to become the suffix it is today. I assume our relaxed enunciation of the term has lead to the incorrect use of ''apedia. ''

Would I be correct in assuming that, or is there some intricate ruleset dictating which vowel is used for what word depending on the preceding letters? 