Where does “tertius decimus” come from?

tertius decimus (Latin) comes from Latin tredecim, from Latin decem, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

tertius decimus (Latin): thirteenth

Definitions

  1. thirteenth

Ancestry of “tertius decimus”, step by step

StepLanguageWordMeaning
1Latintredecimthirteen; 13
2Latindecemten; 10
3Latin-nus-an
4Proto-Italic-nosCreates verbal adjectives from verb stems
5Proto-Indo-European-nósCreates verbal adjectives from roots
Every word from Proto-Indo-European -nós →Every word from Latin -nus →Every word from Latin decem →