Where does “lämpökirjoitin” come from?

lämpökirjoitin (Finnish) comes from Finnish kirjoitin, from Finnish -in, from Proto-Finno-Ugric *-in, from Proto-Uralic -ma.

Ancestry of “lämpökirjoitin”, step by step

lämpökirjoitin traces back through two separate lines of ancestry.

via Finnish kirjoitin

StepLanguageWordMeaning
1FinnishkirjoitinSynonym of tulostin; First-person singular...
2Finnish-inSuffix variant for the illative singular, see...
3Proto-Finno-Ugric*-in
4Proto-Uralic-ma

via Finnish lämpö

StepLanguageWordMeaning
1Finnishlämpöwarmth, heat; heat; fever
2Finnish-oForms result or action nouns from verbs; Forms...
3Proto-Finnic-oForms action/result nouns from verbs
4Proto-Uralic-w
Every word from Proto-Uralic -maEvery word from Finnish -inEvery word from Finnish kirjoitin