This is the 10795th most frequent German word.
rust
The German word "Rust" refers to a town in Germany.
Here, 'Rost' refers to the reddish-brown oxide coating formed on iron or steel due to moisture.
Der alte Nagel ist mit Rost bedeckt.
The old nail is covered with rust.
In this context, 'rustikal' is derived from the same root as 'Rost' and conveys a rural or simplistic characteristic.
Das Brot hat einen etwas rustikalen Geschmack.
The bread has a somewhat rustic taste.
Similarly, 'rustikal' here emphasizes simplicity and a traditional style.