brown bread; rye bread
Refers to dark-colored breads, typically rye or whole-grain, as opposed to white bread (白パン).
朝食に黒パンを食べた。
I had brown bread for breakfast.
The brown bread at this shop is made with rye.
Compound of 黒 (くろ, 'black') and パン ('bread'), a straightforward descriptive term for dark breads.