noun
black oak
Refers to a type of oak tree, specifically Quercus myrsinifolia or similar species. Botanical term; in everyday contexts, simply 樫 (かし) may be used.
公園の隅に大きな黒樫が立っている。
A large black oak stands in the corner of the park.
樫 is the general term for evergreen oak; 黒樫 specifies the black oak variety.
Compound of 黒 (くろ, 'black') + 樫 (かし, 'evergreen oak'), referring to the dark bark or leaves of this oak species.