This is the 14107th most frequent Russian word.
оленьей
The Russian word "оленьей" means "deer's" (possessive form of "олень," meaning "deer").
Describes the material origin, 'оленей' used adjectivally.
Я купил шапку из оленьей шерсти.
I bought a hat made of reindeer wool.
Indicates possession/association, 'оленей' modifies 'path'.
В лесу видна тропа оленьей стези.
In the forest, the trail of the reindeer path is visible.
Possessive/adjectival, 'оленей' related to 'feeder'.