Where does “tegur” come from?

tegur (Icelandic) comes from Icelandic tegra, from Danish integrere, from Latin integrāre.

tegur (Icelandic): integral

Definitions

Step	Language	Word	Meaning
1	Icelandic	tegra	to integrate
2	Danish	integrere	to integrate
3	Latin	integrāre	—

tegur — Etymology, Origin & Word History | Etymology Explorer