V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry निगरणम्
निगरणम्nigaraṇam1 Swallowing, devouring.
1 Swallowing, devouring.
(Fig.) Taking up, completely absorbing.
Derived forms and compounds
-णः
The throat.
The smoke of a sacrificial fire or burnt offering.