TRI-


Meaning of TRI- in English

[tri-] comb form [ME, fr. L (fr. tri-, tres) & Gk, fr. tri-, treis--more at three] 1: three: having three elements or parts "trigraph"

2: into three "trisect"

3: thrice "triweekly": every third "trimonthly"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.