Where does “поперечник” come from?

поперечник (Russian) comes from Russian поперёк, from Proto-Slavic perkъ, from Proto-Indo-European preh₂-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

поперечник (Russian): diameter

Definitions

  1. diameter

Ancestry of “поперечник”, step by step

поперечник traces back through two separate lines of ancestry.

via Russian поперёк

StepLanguageWordMeaning
1Russianпоперёкacross, athwart; across, crosswise
2Proto-Slavicperkъtransverse, direct
3Proto-Indo-Europeanpreh₂-before, in front
4Proto-Indo-Europeanper-before, in front; first; to go through
5Proto-Indo-Europeanpr̥tóspassed , crossed

via Ukrainian по́перек

StepLanguageWordMeaning
1Ukrainianпо́перекwait, loins, small of the back, lumbar region
Every word from Proto-Indo-European pr̥tósEvery word from Proto-Indo-European per-Every word from Proto-Indo-European preh₂-