Where does “thra” come from?

thra (Middle English) comes from Old Norse þrár, from Proto-Germanic þrawaz, from Proto-Indo-European ter-, from Italian termine, from Latin terminus, from Proto-Italic termenos, from Proto-Indo-European térmn̥ — boundary, end.

Ancestry of “thra”, step by step

StepLanguageWordMeaning
1Old Norseþrárstubborn, obstinate; genitive singular indefinite...
2Proto-Germanicþrawazstubborn, obstinate
3Proto-Indo-Europeanter-tender, weak; young creature
4Italiantermineend, close; limit, term, date, time; term, word
5Latinterminusa boundary, limit, end
6Proto-Italictermenos
7Proto-Indo-Europeantérmn̥boundary, end
Every word from Proto-Indo-European térmn̥Every word from Proto-Italic termenosEvery word from Proto-Indo-European ter-