Where does “autobussijaam” come from?

autobussijaam (Estonian) comes from Proto-Mon-Khmer jaam, from Russian ям — mail staging post; genitive plural of я́ма.

Ancestry of “autobussijaam”, step by step

autobussijaam traces back through two separate lines of ancestry.

via Proto-Mon-Khmer jaam

StepLanguageWordMeaning
1Proto-Mon-Khmerjaamto weep, to cry; Compare Korku "jaːm"
2Russianямmail staging post; genitive plural of я́ма

via Estonian autobuss

StepLanguageWordMeaning
1Estonianautobussbus
2Estonianautocar, automobile; any motor vehicle, including...
Every word from Russian ям →Every word from Proto-Mon-Khmer jaam →