Where does “tritium” come from?

tritium (Finnish) comes from English tritium, from Ancient Greek τρίτος, from Ancient Greek τρι-, from Ancient Greek τρεῖς, from Proto-Hellenic tréyes, from Proto-Indo-European *tréyes.

tritium (Finnish): tritium

Definitions

tritium

Ancestry of “tritium”, step by step

Step	Language	Word	Meaning
1	English	tritium	A radioactive isotope of the element hydrogen (symbol T, 3H or) having one proton and two neutrons
2	Ancient Greek	τρίτος	third
3	Ancient Greek	τρι-	tri-
4	Ancient Greek	τρεῖς	three
5	Proto-Hellenic	tréyes	three
6	Proto-Indo-European	*tréyes	—

Every word from Proto-Indo-European *tréyes →Every word from Proto-Hellenic tréyes →Every word from Ancient Greek τρεῖς →