Where does “thro” come from?

Thro comes from Middle English thro, from Old Norse þrár, from Proto-Germanic þrawaz, from Proto-Indo-European ter-.

thro (English): through; Eager; earnest; vehement; Bold

Definitions

  1. through; Eager; earnest; vehement; Bold

Ancestry of “thro”, step by step

thro traces back through two separate lines of ancestry.

via Middle English thro

StepLanguageWordMeaning
1Middle Englishthro
2Old NorseÞrárname of a dwarf
3Proto-Germanicþrawazstubborn, obstinate
4Proto-Indo-Europeanter-tender, weak; young creature
5Italiantermineend, close; limit, term, date, time; term, word
6Latinterminusa boundary, limit, end
7Proto-Italictermenos
8Proto-Indo-Europeantérmn̥boundary, end

via English through

StepLanguageWordMeaning
1EnglishthroughFrom one side of an opening to the other;...
2Middle Englishthrugh
3Old EnglishþurhAPI; through; by means of: by, through, via
4Proto-Germanicþurhwthrough
5Proto-Indo-Europeantr̥h₂kʷe
6Proto-Indo-Europeanterh₂-to cross over, pass through, overcome
Every word from Proto-Indo-European térmn̥Every word from Proto-Italic termenosEvery word from Proto-Indo-European ter-