Where does “постьникъ” come from?

постьникъ (Old Church Slavonic) comes from Old Church Slavonic -ьникъ, from Proto-Slavic -ьnikъ, from Proto-Slavic -ikъ — *nožь → *nožikъ; *větrъ → *větrikъ; *listъ →...

постьникъ (Old Church Slavonic): one who fasts

Definitions

one who fasts

Ancestry of “постьникъ”, step by step

Step	Language	Word	Meaning
1	Old Church Slavonic	-ьникъ	Suffix appended to nominal stems to create a...
2	Proto-Slavic	-ьnikъ	From base concept nouns, forms agent nouns who...
3	Proto-Slavic	-ikъ	nožь → nožikъ; větrъ → větrikъ; *listъ →...

Every word from Proto-Slavic -ikъ →Every word from Old Church Slavonic -ьникъ →Every word from Proto-Slavic -ьnikъ →