tri-
prefix
- combining form meaning three
- combining form meaning into three
- combining form meaning thrice
- combining form meaning every third
Wiktionary
Pronunciation: /tɹaɪ/
prefix
Etymology: From Sanskrit त्रि (tri, “three”).
- Used in combination with a known element name (e.g. 'tri-silicon', 'tri-lead') to designate an unknown element that would reside three periods lower than the known element on a Mendeleev-type periodic table. See Mendeleev's predicted elements.