Where does “nibbanic” come from?

nibbanic (English) comes from English nibbana, from Pali nibbāna, from Sanskrit निर्वाण, from Sanskrit निस्, from Sanskrit नि, from Proto-Indo-Iranian ní, from Proto-Indo-European ni — down.

Ancestry of “nibbanic”, step by step

nibbanic traces back through two separate lines of ancestry.

via English nibbana

StepLanguageWordMeaning
1Englishnibbana
2Palinibbānanirvana
3Sanskritनिर्वाणblowing out, extinction, cessation, setting,...
4Sanskritनिस्out, forth, away &c
5Sanskritनिdown; back; in, into
6Proto-Indo-Iraniandown, downwards; in, into
7Proto-Indo-Europeannidown

via English ic

StepLanguageWordMeaning
1Englishicrelated or pertaining to; having the character of
Every word from Proto-Indo-European niEvery word from Proto-Indo-Iranian Every word from Sanskrit नि