Where does “lyhytaaltopuhelin” come from?

lyhytaaltopuhelin (Finnish) comes from Finnish lyhytaalto, from Finnish aalto, from Proto-Finnic alto, from Proto-Germanic aldǭ, from Proto-Indo-European Holdʰō(n), from Proto-Indo-European Holdʰu- — trough, canoe.

Ancestry of “lyhytaaltopuhelin”, step by step

lyhytaaltopuhelin traces back through two separate lines of ancestry.

via Finnish lyhytaalto

StepLanguageWordMeaning
1Finnishlyhytaaltoshortwave, short wave electromagnetic wave with wavelength between appr. 10 and 100 meters
2Finnishaaltowave; outbreak
3Proto-Finnicaltowave
4Proto-Germanicaldǭtrough, hollow
5Proto-Indo-EuropeanHoldʰō(n)
6Proto-Indo-EuropeanHoldʰu-trough, canoe

via Finnish puhelin

StepLanguageWordMeaning
1Finnishpuhelintelephone, phone; Short for puhelinnumero;...
2FinnishpuhellaTo chatter
3FinnishpuhuaTo talk; To speak
4Proto-Finnicpuhudakto blow
5Proto-Uralicpuše-blow
Every word from Proto-Indo-European Holdʰu-Every word from Proto-Indo-European Holdʰō(n)Every word from Proto-Germanic aldǭ