(bound form) hazelnut tree (Corylus heterophylla)

hazelnut kernel; hazelnut "meat"

hazelnut

filbert; hazelnut; cobnut

hazelnut

overgrown with wild plants

filbert

wilderness; bushy and weedy; humble; inferior

(literary) luxuriant vegetation

dense wood

hazel grouse

common hazel (tree) (Corylus avellana)

erhua variant of 榛仁[zhen1 ren2]

(bird species of China) Chinese grouse (Tetrastes sewerzowi)

(bird species of China) hazel grouse (Tetrastes bonasia)

thorns and brambles as far as eye can see (idiom); beset by troubles