Where does “röyhähdys” come from?

röyhähdys (Finnish) comes from Finnish röyhähtää, from Finnish -ähtää, from Proto-Finnic -ahtadak, from Proto-Uralic -ašta-.

Ancestry of “röyhähdys”, step by step

StepLanguageWordMeaning
1Finnishröyhähtääto burst (into) flames, smoke, etc
2Finnish-ähtääFront vowel variant of -ahtaa
3Proto-Finnic-ahtadakForms momentane verbs
4Proto-Uralic-ašta-—
Every word from Proto-Uralic -ašta- →Every word from Finnish -ähtää →Every word from Finnish röyhähtää →
röyhähdys — Etymology, Origin & Word History | Etymology Explorer