This is the 12429th most frequent Russian word.
кедровыми
"Кедровыми" means "cedar" (instrumental plural form, related to cedar trees or nuts).
Here, 'кедровыми' is an adjective in the instrumental plural form describing 'орехами' (nuts), indicating that they are related to cedar.
Мы наслаждались кедровыми орехами в лесу.
We enjoyed cedar nuts in the forest.
In this sentence, 'кедровыми' is an adjective in the instrumental plural form describing 'деревьями' (trees), specifying their association with cedar.
Кедровыми деревьями покрыты склоны этой горы.
The slopes of this mountain are covered with cedar trees.
Here, 'кедровыми' is used as an adjective in the instrumental plural form modifying 'ветвями' (branches), clarifying that the branches are from cedar.