Where does “tere” come from?

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

tere (Finnish): piping

Definitions

Step	Language	Word	Meaning
1	Finnish	terä	blade, edge; head; terminal part of the leg, foot
2	Proto-Finnic	terä	blade, edge; ear of corn; grain, corn
3	Proto-Finno-Permic	terä	edge

tere — Etymology, Origin & Word History | Etymology Explorer