Why is it der Tennisklub?

Tennisklub is a compound noun, and German compounds take the article of their last word: der Klub. So it’s der Tennisklub.

Sense 1
der

Meaning

[1] Organized merger of people for the purpose of playing tennis together

[1] organisierter Zusammenschluss von Menschen zum Zwecke des gemeinsamen Tennisspielens

Examples

[1] After a long time, I recently returned to the tennis club

[1] Nach langer Zeit bin ich neulich erst wieder in den Tennisklub eingetreten.

Declension

1 Singular Plural
Nominativ der Tennisklub die Tennisklubs
Genitiv des Tennisklubs der Tennisklubs
Dativ dem Tennisklub den Tennisklubs
Akkusativ den Tennisklub die Tennisklubs

Pronunciation

In context

Dictionary entries include material from Wiktionary. Wiktionary