Where does “पितृयज्ञ” come from?

पितृयज्ञ (Sanskrit) comes from Sanskrit य॒ज्ञ.

पितृयज्ञ (Sanskrit): oblation made to ancestors

Definitions

Step	Language	Word	Meaning
1	Sanskrit	य॒ज्ञ	—

पितृयज्ञ — Etymology, Origin & Word History | Etymology Explorer