vokaalisointu I-E

Looking through a list of "vokaalisointu I-E" i found länki, but I've been unable to find a translation for it. Could you help me?

Another word is ääri, which it says to mean edge, bu8t edge as frame or edge of a blade?
Also hiisi... It's holy grove, but grove as a habit?

Détails supplémentaires:

Ääri I found to be edge as end of a paper.
And Hiisi as "devil"

But I hasn yet not found länki anywhere and everywhere I looked for it was an empty record....