Finnish word opiskella comes from Finnish oppia, Finnish -skella

Detailed word origin of opiskella

Dictionary entry	Language	Definition
oppia	Finnish (fin)	(intransitive) To learn (to do something = active 3rd infinitive in illative, -maan/-mään).. (transitive) To learn (something).
-skella	Finnish (fin)
opiskella	Finnish (fin)	(transitive, intransitive) To study something (to pursue studies of, e.g. at a university).

Words with the same origin as opiskella