Where does “ultradecennale” come from?
ultradecennale (Italian) comes from Italian decennale, from Latin decennālis, from Latin decennium, from Latin decennis, from Latin annus, from Proto-Italic atnos, from Proto-Indo-European h₂et-no-, from Proto-Indo-European h₂et- — grass.
ultradecennale (Italian): For more than ten years
Ancestry of “ultradecennale”, step by step