Where does “ज्वालामुखी” come from?

ज्वालामुखी (Hindi) comes from Sanskrit ज्वाला-मुख.

ज्वालामुखी (Hindi): volcano; volcanic

Definitions

Step	Language	Word	Meaning
1	Sanskrit	ज्वाला-मुख	—

ज्वालामुखी — Etymology, Origin & Word History | Etymology Explorer