This is the 1373rd most frequent German word.
darmstadt
"Darmstadt" is not a dictionary word; it is the name of a city in Germany.
In this sentence, 'Darmstadt' is used as the proper noun and name of a city.
Darmstadt ist eine Stadt in Hessen.
Darmstadt is a city in Hesse.
Here, 'Darmstadt' appears as a locative proper noun indicating the place of study.
Ich habe in Darmstadt studiert.
I studied in Darmstadt.
In this example, 'Darmstadt' indicates a geographical reference relative to its surroundings.