Rottweiler

Borrowed from German Rottweiler, from German Rottweil

Rottweiler (plural Rottweilers)

1. A very large muscular breed of dog of German origin with black fur and tanned markings.

Rottweil +‎ -er

• IPA^(key): /ˈʁɔtvaɪ̯lɐ/

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Rottweiler m (genitive Rottweilers, plural Rottweiler, female Rottweilerin)

1. a man from the city of Rottweil
2. Rottweiler (dog breed)

Rottweiler (invariable)

1. from, of, or pertaining to Rottweil

• Words like this are indeclinable adjectives in modern German, as noted by the Duden, DWDS and other modern references. They originated as genitive plurals of substantives, as noted by 18th century grammarian Johann Christoph Adelung and 19th century linguist Hermann Möller: e.g. Berliner Pfannkuchen = Pfannkuchen der Berliner = "pancake of the Berliners". See -er.