Where does “sisäterä” come from?

sisäterä (Finnish) comes from Finnish terä, from Proto-Finnic terä, from Proto-Finno-Permic terä — edge.

Ancestry of “sisäterä”, step by step

StepLanguageWordMeaning
1Finnishteräblade, edge; head; terminal part of the leg, foot
2Proto-Finnicteräblade, edge; ear of corn; grain, corn
3Proto-Finno-Permicteräedge
Every word from Proto-Finno-Permic terä →Every word from Proto-Finnic terä →Every word from Finnish terä →