Where does “thousandth” come from?

Thousandth derives from Old English -þ, a suffix from Proto-Germanic -iþō and ultimately Proto-Indo-European -tós, which formed ordinal numbers from cardinal numbers.

thousandth (English): The ordinal numeral form of one thousand; last in...

Definitions

  1. The ordinal numeral form of one thousand; last in...

Ancestry of “thousandth”, step by step

StepLanguageWordMeaning
1EnglishthousandA numerical value equal to 1,000 = 10 × 100 = 10
2Middle EnglishthousendA thousand; 1000
3Old Englishþūsendthousand
4Proto-West Germanicþūsundithousand
5Proto-Germanicþūsundīa thousand
6Proto-Indo-EuropeantuHsont-thousand
7Proto-Indo-Europeantewh₂-to swell; to crowd; to be strong
Every word from Proto-Indo-European tewh₂-