Where does “ultrathin” come from?

Ultrathin comes from English ultra combined with thin, where ultra derives from Latin ultra meaning "beyond" and thin traces to Proto-Indo-European h₂el- meaning "to go" or "move."

ultrathin (English): Extremely thin; of utmost thinness

Definitions

  1. Extremely thin; of utmost thinness

Ancestry of “ultrathin”, step by step

StepLanguageWordMeaning
1EnglishthinHaving little thickness or extent from one...
2Middle Englishthinnethin, narrow, skinny, slender; weak; sparse,...
3Old Englishþynnethin
4Proto-West Germanicþunnīthin
5Proto-Germanicþunnuzthin
6Proto-Indo-Europeanténh₂usthin
7Proto-Indo-Europeantenh₂-to stretch, to extend
8Proto-Indo-Europeanten-to stretch, to extend

Words derived from “ultrathin

Every word from Proto-Indo-European ten-Every word from Proto-Indo-European tenh₂-Every word from Proto-Indo-European ténh₂us