Where does “semitertianus” come from?

semitertianus (Latin) comes from Latin tertianus, from Latin tertius, from Latin trēs, from Proto-Italic trēs, from Proto-Indo-European *tréyes.

Ancestry of “semitertianus”, step by step

StepLanguageWordMeaning
1Latintertianusbelonging to the third
2Latintertiusthird, the ordinal number after secundus and...
3Latintrēsthree; 3
4Proto-Italictrēsthree
5Proto-Indo-European*tréyes—
Every word from Proto-Indo-European *tréyes →Every word from Proto-Italic trēs →Every word from Latin trēs →